#help-0

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lone heartBOT
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@edgy mantle Has your question been resolved?

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hot sleet
lone heartBOT
hot sleet
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been stuck here for 3 hours and no YouTube tutorial has helped me lmao

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would converting 1-cos to 1-sin(x/2) would do the trick?

tacit arch
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@hot sleet Has your question been resolved?

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wheat pendant
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I have some questions regarding the differential equation problem.

wheat pendant
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However, when i asked wolfram to solve it gave a very different result.

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What did i missed on this one?

lone heartBOT
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@wheat pendant Has your question been resolved?

wheat pendant
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<@&286206848099549185>

tacit arch
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the previous -2 became a +2

wheat pendant
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OH MY GOD

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but using the reduction order doesn't require that term

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isnt it?

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since y1 already present which i need to only get y2 to get the general solution

tacit arch
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i don't know the reduction of order technique you learned

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which requires you to solve for a v(t) that equals to y_2(t) = v(t) * (known solution)

wheat pendant
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okay thanks for the info

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ill try again

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timber jungle
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Task in text form: Given a rectangle ABCD inscribed in a circle ω with center O. The line ℓ
passes through O and intersects the segments BC and AD at points
E and F, respectively. The points K and L are the points of intersection of ℓ and ω, with the points K, E,
F, L lying in that order on the line ℓ. The lines tangent to ω at points
K and L intersect the line CD at points M and N, respectively. Prove that the points E, F, M, N lie on the same circle.

S is the center of circle which existance should be proved, figured it out in geogebra just to make drawing a proof a bit more convenient
what I figured out so far:

  1. obviously LN and KM are parallel
  2. using the Thales's theorem I can prove, that if I draw the circle with the diameter MN and center S and draw parallel to LN going through O, it will also go through S.
    So I can tell that ES=FS and MS=NS, so now I only need to prove that ES=MS or FS=NS.
  3. Through geogebra I figured out that ∠OSE = ∠CME - ∠EMK = const for the same rectangle

And after this I couldn't come up with anything that can help me.
I can send the geogebra file here if somebody needs it and if I'm allowed to.

tiny sky
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could u send me a geogebra link?

timber jungle
tiny sky
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ah nw it's fine

timber jungle
tiny sky
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it doesn't take that long to draw up in geogebra

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also idk how geogebra files work lol

timber jungle
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I just click open and there is local file button

tiny sky
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i have to go now, i'll think abt this when i'm back

timber jungle
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okay 👊

tiny sky
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i'd like to preface this by saying that i really really suck at olympiad geometry

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but just an observation

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CMKE and NBFL are cyclic

timber jungle
tiny sky
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so can we use that to angle chase DNF etc.?

timber jungle
timber jungle
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thx for idea

lone heartBOT
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@timber jungle Has your question been resolved?

tiny sky
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ok so if u angle chase correclty

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you get that the question is equivalent to proving that AL = BK

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which is true

timber jungle
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for example on the drawing I made AL is longer than BK

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Maybe I'm missing something and I made a bad drawing

tiny sky
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oh wait i've might not have the right labellings

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oh yeah my points are labelled badly lol

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lemme relabel my points 1 sec

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right ok so i'll walk u through my thought process

tiny sky
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sometimes adding in the circle can be useful but here i think it clutters the diagram

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so there's many ways to show something is cyclic

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for example, if we could prove NFE + NME = 180 we'd be done

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now think about why that is equivalent to proving that NFD = EMK

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did that make sense @timber jungle ?

timber jungle
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Okay, my guess is that if those angles are equal, that means that △NDF~△EMK and that should mean somehow that △NLF~△CME. If △NLF~△CME, I wrote few equations and I proved that NFE + NME = 180 @tiny sky

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But now I don't really understand how to prove that △NLF~△CME and the original statement that NFD = EMK, but I'm on my way to understand this

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okay, I managed to prove that △NLF~△CME. Now everything you said makes sense @tiny sky

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The only thing left is to prove that NFD = EMK

tiny sky
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DFE + FEC = 180

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FEC = KMC

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so then look at that and realise that that's equivalent to NFD = EMK

tiny sky
tiny sky
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so it suffices ot show BK = DL

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which is true by symmetry/drawing in a few lines to show that 2 triangles are congruent

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hope that all made sense @timber jungle

timber jungle
tiny sky
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KMC = EMC + KME

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DFE = NFE - NFD

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so EMC + NFE + (KME - NFD) = 180

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so suffices to show KME - NFD = 0

timber jungle
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that makes sense

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so how would you prove that NFE + NME = 180 because of that?

tiny sky
timber jungle
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man, you're writing in an occupied

ancient lynx
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oops

lone heartBOT
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@timber jungle Has your question been resolved?

timber jungle
# tiny sky ^

I thought I understand, but I don't. So from your equation to prove that KME = NFD, EMC + NFE should be equal to 180, so that we can get KME - NFD = 0
But I can't find when did we get this information and if we have this info, we are already done because EMC = NME
And I don't really understand the part with the triangles, what are you trying to prove with those triangles? And am I getting this right, you proved that △DFL = △BKE?
Sorry to bother you for such a long time, it's just difficult for me to understand this

tiny sky
tiny sky
timber jungle
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okay, seems like I'll just need to try to rethink it a hundred times more tomorrow until I get it. Anyway, thank you very much for helping me out, at least I'm not stuck anymore @tiny sky

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lone heartBOT
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lone heartBOT
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round zealot
lone heartBOT
round zealot
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Ik that the sqrt of 65 is about 8, but with the negative in front of the sqrt symbol, if I keep -8 it won't work because -8 squares is positive 64

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for 22

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<@&286206848099549185>

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<@&286206848099549185>

tacit arch
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chill your pings

round zealot
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ok

round zealot
tacit arch
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just wait

round zealot
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ok

strange schooner
round zealot
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how

strange schooner
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And second, fairly sure that - was there just so you had to write -9 instead of 9, from the looks of it, you haven't taken complex numbers, which would be needed to get a negative result when squaring

round zealot
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also guys i ment question 22

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??

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round zealot
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.reopen

lone heartBOT
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round zealot
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.close

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lone heartBOT
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strong night
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Hi

lone heartBOT
strong night
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Can i get help on these two plz. Im very confused

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Plz @ me when responding. Thanks

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<@&286206848099549185>

smoky crane
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.reopen

pseudo ice
strong night
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Still cant do it @pseudo ice

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😭

pseudo ice
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Of which one? Both of them?

strong night
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Workin
On first rn

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Rlly need help wit it. Been doing it for a while

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@pseudo ice

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Im tryinh to factor an x from numerator right?

pseudo ice
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If you can make a factor of x appear in the numerator appear, yep

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Right, you’re happy that the general difference of two cubes is
[
(a - b)(a^2 + ab + b^2) = a^3 - b^3
]

ocean sealBOT
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@pseudo ice

strong night
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I did that but then do i like multiply it out?

pseudo ice
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Well, we have cube roots, and somehow want to get rid of them

strong night
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My teacher recommended thid

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This

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And said to use the formula

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Idk where to go from here

pseudo ice
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Yep, so notice how our numerator is (a - b) right now, if we multiplied it by something, we would turn it into (a^3 - b^3)

strong night
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Ohhh

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Cube top and bottom?

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Is that what ur saying? @pseudo ice

pseudo ice
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Noooo SCNOOOO

strong night
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Oh

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@pseudo ice

pseudo ice
strong night
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Idk @pseudo ice

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☹️

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Brainfart

pseudo ice
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Awwww sadcat

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Do you at least see it now?

strong night
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No

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@pseudo ice

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Oh im dumb

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Its the other part of the formula

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Asquared plus ab plus b squared

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Y do we want to multiply by this tho? What is being accomplished by getting a cubed minus b cubed?

pseudo ice
pseudo ice
pseudo ice
strong night
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Not yet lemme do that so multiply top and bottom? @pseudo ice

pseudo ice
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Yep, multiply top and bottom by that a^2 + ab + b^2

strong night
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K one second

pseudo ice
# strong night

You know the numerator becomes a^3 - b^3, so then check what that is with your choices of a and b

strong night
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So top is x?

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Lemme do bottom rq

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@pseudo ice

pseudo ice
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You don’t need to really expand it out, just leave it as x(a^2 + ab + b^2) and then cancel the x in the denominator with the x you get from the numerator

strong night
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Ohhhhh

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Ur right

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Can we do second one together ur rlly good help btw

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@pseudo ice

pseudo ice
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Sure catokay

strong night
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Thx alr lemme just right answee for first one

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@pseudo ice ok moving onto next one

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Not rlly sure where to start ngl

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Divide everything by highest power of x?

pseudo ice
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Well, I mean, you could, if you’re careful about it-

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As the limit of x is going to infinity, we can safely assume x is positive

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Now, if x is positive, what’s sqrt{x^2}?

strong night
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I want to do the same steps my teacher would do

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This is all the notes @pseudo ice

pseudo ice
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,rccw

ocean sealBOT
strong night
pseudo ice
strong night
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I think i would need to divide everything right?

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So would i divide by x or x squared @pseudo ice

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I see the highest power is x squared but it rlly is just x

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@pseudo ice

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Is this right?

pseudo ice
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Then use the fact you have x as sqrt{x^2} to simplify the insides of the root

strong night
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Wait can i take out a term if root?

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@pseudo ice

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Under root

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I kinda forget this

pseudo ice
strong night
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@pseudo ice can i take out 9x squared?

pseudo ice
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You could if you wanted to, sure catokay

strong night
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Wait but i have a question

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Can u always take out a term if it is able to from under a square root. For example: root of 9-5 is 2 but then if u favtor out 9 first then its 3 times root of negatuve 5

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@pseudo ice

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I always get confused on this

pseudo ice
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Well, if you factor 9 out, it’s 3 * sqrt{1 - 5/9}, which works out as 3 * sqrt{4/9}

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And of course sqrt{4/9} is 2/3

strong night
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Wait can u say tht more simply @pseudo ice

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Like clearly

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Where do u get 5/9 from

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And 4/9

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I dont think i can factor is out @pseudo ice

pseudo ice
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Because you're factoring the insides, you first need to factor a 9 from 9 - 5

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And as 9 - 5 = 9(1 - 5/9), as you have to divide the "other term" by 9

strong night
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O ya. I think i have had too much math for today. After this question i will stop

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So i will go ahead and factor the x on’y

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@pseudo ice o wait but if i factored 9 it would be just a negative under tje root

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O wait no

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Nvm

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1

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  • whatever
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-*

pseudo ice
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Remember that if you factor, you have to divide everything by what you're factoring out

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So like if you factored an a from a^2 + 3a, you get a(a + 3)

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so the a^2 gets divided by a, and the 3a gets divided by a too

strong night
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Is this right?

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So far?

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Or did i make a mistake

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@pseudo ice

pseudo ice
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Not quite, no

strong night
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@pseudo ice oh

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Damn

pseudo ice
ocean sealBOT
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@pseudo ice

strong night
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Oh no u can’t

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@pseudo ice

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So i cant take anything out of root?

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@pseudo ice

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@pseudo ice im stuck

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Can u explain what and why ur supposed to do

pseudo ice
strong night
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But u said u cant factor

pseudo ice
strong night
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X squared

strong night
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Ok i will do that rn

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Ill do one step at a time and then send to y

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U

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Like this?

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Sorry x

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Not x squared

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Outside

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Wait a minute

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I think i screwed it up

pseudo ice
strong night
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Is this right?

pseudo ice
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Yep, with x on the outside of the root, it is SCgoodjob2

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Now, if you factor an x from the numerator too, that x + 3, in a similar manner

strong night
strong night
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There is one x

pseudo ice
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Alright, new move then-

strong night
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Dont i divide by highest x?

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Power

pseudo ice
# strong night

Rewrite this as $\frac{ (x + 3)/x }{ \sqrt{9 - \frac5x} }$ and work out that $\frac{x + 3}x$ in the numerator

ocean sealBOT
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@pseudo ice

strong night
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How does the x move to numerator @pseudo ice

pseudo ice
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You are aware of how to manipulate fractions, such as the fact that $\frac{a/b}c = \frac{a}{bc}$ right

strong night
ocean sealBOT
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@pseudo ice

strong night
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Ya u just multiply by b

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Top and bottom

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@pseudo ice

pseudo ice
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Well, going backwards is dividing both numerator and denominator by b

strong night
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Are we able to do this way @pseudo ice ?

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Like divide by x highest power?

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My teacjer will mark us like this

pseudo ice
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It’s literally what we are doing, the highest power of both the numerator and denominator is x

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You just need to know how to work with roots and how they simplify

strong night
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Does this work?

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@pseudo ice

wintry shore
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,rotate

ocean sealBOT
pseudo ice
strong night
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It cancels?

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Doesnt it?

pseudo ice
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It cancels with the x you’re dividing by

strong night
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Yes so no need to write?

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@pseudo ice

pseudo ice
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Correct, don’t have the /x for the denominator

charred pilot
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\frac{1}{\sqrt{9-\frac{5}{x}}\cdot\frac{x}{x}+\frac{3}{x}
strong night
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Wait like what i have rn is correct or no? @pseudo ice

pseudo ice
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Now it is

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Because your original was

pseudo ice
strong night
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Oh yes

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Okay ic

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What do i do now

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@pseudo ice

charred pilot
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Sorry not trying to take up space

pseudo ice
charred pilot
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Yeah I was trying to format it for them

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$\frac{1}{\sqrt{9-\frac{5}{x}}\cdot\frac{x}{x}+\frac{3}{x}$

charred pilot
strong night
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@pseudo ice am i close to finishing?

charred pilot
strong night
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Alr

pseudo ice
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The one so you have the denominator of the first \frac

charred pilot
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I tried that in the latex test channel and its still messed up

pseudo ice
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$\frac{1}{ \sqrt{9-\frac{5}{x}} }\cdot\frac{x}{x}+\frac{3}{x}$

ocean sealBOT
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@pseudo ice

strong night
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O wait closer to

#

#

1/3???

charred pilot
#
\frac{1}{ \sqrt{9-\frac{5}{x}} }\cdot(\frac{x}{x}+\frac{3}{x})
charred pilot
pseudo ice
strong night
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Yay

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Thx @charred pilot And @pseudo ice

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.close

lone heartBOT
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rose sigil
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there are some typesetting errors here

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uniformly convergent on R, i'm guessing?

lone heartBOT
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@dim junco Has your question been resolved?

rose sigil
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if so then yea looks fine

ocean sealBOT
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Architect

rose sigil
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not really. you can just take whatever term in the tail (say the first one)

ocean sealBOT
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Architect

rose sigil
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for any k, x^k/k! is unbounded

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by taking limit as x goes to infinity

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so just set k = n + 1

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this sum will be greater than x^(n+1)/(n+1)!

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(if x > 0)

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yep

ocean sealBOT
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Architect

rose sigil
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no

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e.g., $\sup_{x\in R_{\geq 0}} 1/x = \infty$ but $\lim_{x\to\infty} 1/x = 0$

ocean sealBOT
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:bending_skull:

rose sigil
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the sup of a function over a set is like the "largest" (but not quite that, there might not be a largest even if there is a sup) value the function takes over the set

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rose sigil
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what i mean by that is e.g. $\sup_{x\in (0,1)} 2x = 2$ but $2x$ isn't ever 2 for any $x\in (0,1)$

ocean sealBOT
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:bending_skull:

rose sigil
#

but largest is a good intuitive way to think of it

lone heartBOT
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fervent rampart
#

Yo hello mu friends

lone heartBOT
fervent rampart
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i have a question

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how can i learn mathematic?

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Beginner to Professional

livid sage
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what is your current level of mathematics education?

fervent rampart
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Hmmm

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i should low

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What do you think the about

livid sage
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you can answer this by listing the last few math courses you have taken or the current math course you are enrolled in

fervent rampart
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Wait

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i know basic of math

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thats all

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i need so much

livid sage
fervent rampart
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Oh

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the website is so cool bro

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thank you so much

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for your help

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.close

lone heartBOT
#
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lone heartBOT
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tawny imp
#

bro 💀

lone heartBOT
gritty bramble
manic pivot
# tawny imp bro 💀

i went in here to ask for help w actual math probelms theres no way u need help w this wtf

#

is this not common sense like u could have never taken gemoetry and still understand this i would think

tawny imp
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if its so easy then you can help me

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🤷‍♂️

manic pivot
#

no u j have to go thru it it takes like 5-10 min for me to do that easy but a waste of time for me

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im sure theres a lot of nerds in here happy to help

dense vapor
tawny imp
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so its too hard for you to solve?

wide tartan
manic pivot
# wide tartan don't be rude to other users please

the person i said that to wasnt offended i didnt really say anything bad just sorta banter no need to be so sensative what u consider rude isnt subjective and if that guy i said it to has no issue w that i said then i wasnt being rude

wide tartan
wide tartan
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don't tell people in the help channels that the thing that they're struggling with is easy.

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is that better?

manic pivot
#

like im not trying to be problematic i j joined for help w a math problem and saw an easy problem and gave him some shit for it but nothing serious its really sensative and sad that society is so sensative that telling someone that a literal math problem is easy offends someone i wont say it and ill follow ur communist rules to not get banned but u should stand up for whats right and moderate fairly.

dense vapor
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Oh good lord 🤣

manic pivot
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like the person i said it to is literaly putting cat memes at it he doesnt care so im just confused why u as a mod felt the need to say anything about it

manic pivot
tawny imp
#

congratulations, you just spent the 10 minutes that you said it would take to solve that problem on arguing with a highschooler

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good job

manic pivot
#

like ik im making a big deal abt it but theres no way that u guys responding to it dont see my point thats why i argued abt it sm baffels me that ppl r like this

wide tartan
#

can we keep it on-topic please - I think I'm done here

manic pivot
manic pivot
wide tartan
#

can we please get back on-topic now?

tawny imp
#

yeah

tawny imp
manic pivot
# wide tartan can we please get back on-topic now?

i dont have big enough issues of how u carry out the role to message mod mail its just not okay how u do this and dont care about being unfair and when i call it out u laugh at it but anyways since u wanna be like that then please answer this at least mod person how do i make a thingy thing to ask my math question?

wide tartan
tawny imp
#

can you just quit the yappin and go do something useful? you have a lot better to do then argue with a high schooler yk

manic pivot
#

taking a few mintues to argue with someone while im doing a math assignemnt is considered useful to me since it doesnt take that much time and i do it to try and understand where lower intelligent indivisuals are coming from sometimes i like to understand others povs cus for ex i genuinely cannot fathom how someone that has nothing to do w me or u can look at me basically telling u that ur math problem is easy and then be like OMG DID THIS PERSON JUST CALL A MATH PROBLEM EASY AND MAKE A JOKE OMGGG I NEED TO TAG A MOD THAT IS SO WRONG like its crazy anyone is like that i was arguing to try to understand their pov but they just ignored all the logic i was spitting back at them becasue i dont even think they understood why they got upset themselves

tawny imp
#

erm

#

"considered useful"

subtle birch
#

what the sigma

wide tartan
tawny imp
#

what have you accomplished by arguing with me

urban tree
#

W

manic pivot
azure needle
#

Please mute 'em

tawny imp
#

yeah im done

wide tartan
# tawny imp bro 💀

for reference for people coming in: here is the original problem, no progress has been made yet

tawny imp
#

<@&286206848099549185>

latent ore
#

Ok

tawny imp
#

ignore everything in between the problem i posted and smay's last message

rare gale
#

are you familiar with what a tangent is and some of the properties of tangents?

tawny imp
#

not really no :/

#

my math program tends to explain things very simply and make hard problems

rare gale
#

well in short, a line or line segment "is tangent" to a circle if it intersects it at a single point

tawny imp
#

alr

rare gale
#

so you can think of that as just grazing the outside of the circle, but not passing through the interior area

tawny imp
#

so like the line AD or AB?

rare gale
#

right, we can say those line segments are tangent to the circle

tawny imp
#

okay

rare gale
#

one of the key properties with tangents is that if you draw a radius of the circle from the point where they hit the circle, the radius and the tangent line \ segment will form a right angle

exotic belfry
#

do you really expect helpers should know what (for example) "Axiom 4 (Lesson 7)" means?

rare gale
#

so for example you can see segment AB here is part of a line that intersects the circle at a single point

#

and if O is the center of the circle, then angle ABO will be a right angle

tawny imp
#

huh ok

tawny imp
rare gale
#

so summary so far:

  1. tangents intersect a circle at a single point, "grazing the outside"
  2. they form right angles with some radius of the circle at the point of tangency
#

btw in that problem you showed, are you also supposed to change the order of the different steps?

#

because AB ~= AD doesn't really seem like the first step in the proof

tawny imp
#

its just a drop down menu to select which one defines the step best

rare gale
#

hmmcat confusing because for the AB congruent to AD step i would think you would have to establish that BE congruent to ED first, but that step is further down

#

reposting so don't have to scroll up

#

so anyway, you chose circle definition for step 2, why was that? can you maybe show list of available options and think a bit more \ reconsider what you think it might be?

fickle heath
rare gale
#

so if you don't know what any of these options mean, you probably won't be able to answer the question. so if that theorem sounds unfamiliar, can you look it up in your book or wikipedia as you want and see what it means?

#

what does tangent segment theorem state?

fickle heath
#

(the question is kinda terrible because of it, since the proof of that theorem - if I understand what it is - uses triangle congruency...)

tawny imp
#

i think im just gonna skip the question

#

i did crap on the first half of the lesson so i just gotta pray for higher than 80

exotic belfry
#

***so if you don't know what any of these options mean, you probably won't be able to answer the question. ** thats what i meant before. anyway.

rare gale
tawny imp
#

i dont have a book its video lectures

#

anyways i skipped the question and i got a 66 😭

#

technically i passed

rare gale
#

really, introductory math classes with no book? sigh

#

that's pretty atrocious

#

do you take notes while watching the lectures?

white widget
#

i dont know what i need to do after having found the dimension of the big rectangle (4x+1)(5x+2)

lone heartBOT
white widget
# rare gale !occupied

oh sorry i though it was a general help channel i didnt know it was for one person at the time

lone heartBOT
#

@tawny imp Has your question been resolved?

#
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velvet light
lone heartBOT
dull lintel
lone heartBOT
# velvet light
What step are you on?
1. I don't know where to begin.
2. I have begun but got stuck midway.
3. I got an answer but I was told that it's wrong.
4. I got an answer and would like my work checked.
5. I have a question about someone else's work/solution.
6. I have completed the problem and don't need help anymore. Thank you.
7. None of the above
velvet light
#

1

dull lintel
# velvet light 1

Replace A with B-d
And C with B+d

Then use sine sum and difference formulas

velvet light
#

thanks

#

.close

lone heartBOT
#
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solemn geyser
#

hi

lone heartBOT
solemn geyser
#

i am not really familiar with the english vocabulary for structures so please excuse me

#

i found that A5 , the group of even permutations of 5 elements is of the order of 60

#

and even though 6 devise 60 there exist no sub group of the 6th order

#

but couldn't we consider the group generated by (12) and (345)

#

since they can commute with each other we can consider it isomorphe with Z/3Z x Z/2Z

wide tartan
#

(12) is not an even permutation

#

that does not mean that A5 doesn't have a subgroup of order 6, though.

#

you can consider <(123), (12)(45)> and that's a subgroup of A5 with order 6 👍

solemn geyser
#

thanks!

#

but then since we've got cauchy's theorem that state that for every prime divisor of the order of the set there exist a sub group of that order

#

this means that there are non prime divisors of this order where there doesn't exist a subgroup of that order

wide tartan
#

there are some examples even in A5 yeah

#

15, for example

solemn geyser
#

oooooh i am dumb

#

but is there a way to know such a sub group

wide tartan
wide tartan
solemn geyser
#

then we can't have two permutations that generate a group of the order 15 if we don't have a permutation of the 3rd order that can switche with another of the 5 order

#

but why is them being able to switch so important

wide tartan
#

well, it's not incredibly important, except for the fact that the only group of order 15 is cyclic

#

for 6, there are non-cyclic groups of order 6, and we were able to find it in A5 by taking a group generated by two elements that was not isomorphic to Z/6 (notice how in my example the generating elements were, in fact, not disjoint permutations)

#

but for 15 we can't do that.

solemn geyser
#

yes but why can't we find a permutation of order 3 and another of order 5 and then see what they generate(in A5 we can't because there necessarily exist some elements that are in the cycle of the 3rd order permutation and the 5th order one at the same time)

#

this means that it's because the two permutations can't switch position with one another

solemn geyser
#

now i am more confused lol

wide tartan
#

well, Z6 is not the only place to look for subgroups of order 6

#

in fact, there are no cyclic subgroups of order 6 in A5

solemn geyser
#

yes i agree with that

#

but the subgroup doesn't have to be cyclic

wide tartan
#

that's right

#

so what you might do, is see if there are any other isomorphism classes (the example that i gave was isomorphic to S3)

solemn geyser
#

what i understood is that the cycles being disjoint doesn't matter at all

wide tartan
wide tartan
solemn geyser
#

i still don't get how your example works out

#

no wait i see

#

same cardinal

#

but then why can't we do the same to 15

wide tartan
#

because the only group of order 15 is isomorphic to Z/5 x Z/3

solemn geyser
#

oooh yeah yeah i get it now Z/15 isn't a group i

wide tartan
#

Z/15 is isomorphic to Z/5 x Z/3

#

it is a group but those two are the same isomorphism class

#

and we already know that we can't find one like that in A5 (because Z/15 is abelian!)

#

so now there's nothing left to check

solemn geyser
#

yes

solemn geyser
#

i am sorry for asking so much

wide tartan
#

don't be sorry, i enjoy talking about it

solemn geyser
#

oooooh i get it now in the first case the subgroup didnn't have to be cyclic so we could consider S3 since it is also of the order 6 but this doesn't work for 15 since we don't have another group other than Z/15 to work with in the first place

wide tartan
#

yep

solemn geyser
#

i get it now

#

thank you so much

wide tartan
solemn geyser
#

thanks , this seems like it would help!

#

.close

lone heartBOT
#
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lone heartBOT
#
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placid flume
#

Solve tan(2x) + 1/sin(x) = 1/tan(x) + 1/sin(5x)

placid flume
#

i have actually tried bashing it out algebraically

#

i can confirm

#

it does not work at least not easily

#

there MAY be a geometric solution however i don't see how to find it

#

PLEASE help

unborn plover
#

oh wait that's not a trig identity

#

are you just looking for solutions?

placid flume
#

yes

#

what...

slender forge
#

$\frac{\tan(2x)}{1 - \tan^2(x)} = \frac{1}{2\tan(x)}$ and $\frac{1}{tan(x)} = \cot(x) = \frac{\cos(x)}{\sin(x)}$

dull lintel
#

tan(x) is generally not equal to cot(x)

placid flume
#

let him cook

dull lintel
#

sure

slender forge
#

omg i cant get it written

#

1/tanx = cotx

#

YEAH

#

i think thats right now

placid flume
#

but that's NOT equal to sinx/cosx is it?

slender forge
#

😭

#

omg

#

im still just learning texit

placid flume
#

same 😭

ocean sealBOT
#

Quantie

slender forge
#

ok now

#

does this look right ⁉️

placid flume
#

YES

slender forge
#

im so unserious but i know how to solve this i just gotta get this shit right

#

also do you have any specifics for x

placid flume
#

no :(((

#

implied x is real

#

and that's abt all ur getting

slender forge
#

yeyeye

placid flume
#

you're gonna have to write it in the thingy thingy notation

#

yk what i mean

slender forge
#

lemme check so i havennt messed up

#

do you have the answers

placid flume
#

DID U SOLVE IT

slender forge
#

pi/6 and pi/3

placid flume
#

OMGGGGGG

slender forge
#

trig is always messy to write, so thats the solutions then

placid flume
#

wait there's pi/2 as well apparently

#

show ur working

#

show ur working

slender forge
#

makes sense

placid flume
#

i dont need the solutions i cld get them from wolfram alpha i need the working :(((

slender forge
#

not allowed to just give the solution so we will get there together

slender forge
placid flume
#

oh yh ok

slender forge
#

put in the terms in the equation

#

and simplify it

#

whatu get

placid flume
#

what replace the 1/tanx on the RHS with tan2x/2-2tan squared x?

slender forge
#

you can simplify it to sin and cos terms

#

wait this is easier

#

oh

placid flume
#

yeesh ka peesh what now

slender forge
#

rewrite 1/tanx to cotx and bring them to the left and right side

placid flume
#

so what tan2x-cotx + 1/sinx = 1/sin5x?

#

quantie helpppp me

slender forge
#

@placid flume do you follow this

placid flume
#

Yes

#

Nice use of compound angle formulae to get the cos 3x

slender forge
#

Thank

#

Thats the LHS

#

Do you know how to simplify RHS

placid flume
#

Not immediately no but instinct is to use multi angle formulae?

#

That feels wrong however

slender forge
#

Could maybe work with more work, but i used the reciprocal

placid flume
#

??

slender forge
#

sin5x - sinx) / (sin5x * sinx

placid flume
#

oh yh ofc

#

just combining the fractions

#

i gotchu

#

ahh u can cancel sinx from both sides as long as it isn't equal to 0

#

checking that gives the pi/2 solutions

slender forge
#

After simplifying sinx - sin5x you can do that

placid flume
#

how do u do that????

slender forge
#

The sines identity

placid flume
#

remind me???

#

currently i have -cos3x/cos2x = sinx-sin5x all over sin5x

slender forge
placid flume
#

oh yh i've seen that

#

so in this case alpha is x and beta is -5x

#

and then i can re cancel ANOTHER cos 3x of both sides as long as i check when it is eqaul to 0

slender forge
slender forge
placid flume
#

wait so currently the RHS is 2sin(-2x)cos(-3x) all over sin(5x)

#

that simplifies to -2sin(2x)cos(3x) all over sin(5x)

#

and then i divide the cos(3x)?

slender forge
placid flume
#

wait didn't the sinx get cancelled out earlier?

slender forge
slender forge
#

Now for the million dollar question

#

Can you simplify RHS more

placid flume
#

hold up lemme just quickly rewrite everything without cancelling sinx yet

#

wait is that a double minus on the RHS for urs??

slender forge
#

no

placid flume
#

wait the numerator of it is -2cos(3x)sin(2x) right???

#

i dont see the simplification

slender forge
#

what can you do with sin2x

placid flume
#

double angule

#

2sinxcosx

#

WHOAH

slender forge
#

yeah

placid flume
#

and that cancels w the sinx on the bottom

#

right??

#

which is -2sinx*cos3x/sin5x???

slender forge
#

yeah you can cancel now

#

😛

placid flume
#

wait no 4

slender forge
#

but wait for the cos3x

placid flume
#

so we have -4cosx*cos3x all over sin5x

slender forge
#

yeah!

#

and LHS is simplified

#

now multiply both with -1 to get rid of the annoying -

placid flume
#

yes i seeee

#

then NOW can we cancel the cos3x??

#

or is therer still smth brewing

slender forge
#

keep it

placid flume
#

cos so far we have cos3x/cos2xsinx = 4cosxcos3x all over sin5x

slender forge
#

yeah

#

how do you continue

placid flume
#

and we're not removing the cos 3x?

slender forge
#

wait imma actually check

#

maybe i couldve all this time, not that itd matter much anyways

#

ok you cann

#

sorry

#

as long as cosx =! 0 🗿 👍

placid flume
#

yyh yh check those values

slender forge
#

hahaha

#

so yeah you got that without cos3x

#

how do you conntinue

placid flume
#

we have 1/cos2xsinx = 4cosx/sin5x

#

cross multiply the denominators seems natural?

slender forge
#

yep

split aspen
#

@little marlin

placid flume
#

with sin(5x) = 4cosx*cos(2x)*sinx

slender forge
#

yepp

#

now what aristofanes

placid flume
#

there's still the cosx term so i dont think i can fully turn it into a sin polynomial

#

i can turn cos2x into 1-2sin squared x

slender forge
#

thats true

#

but look closer

placid flume
#

i can't see what ur seeing

#

wait is this the angle identity again

slender forge
#

4sin2xcosx * cos2x

#

can you see it

placid flume
#

2sin(2x)cos(2x)

#

i haven't made a mistake there right?

#

WHICH GOES TO SIN(4X)

charred pilot
slender forge
#

yeahh

placid flume
#

so we're looking for values when sin(4x) = sin(5x)

slender forge
#

you go back to -2cos3xsin2x

placid flume
#

okok

#

nice CRAZY reduction

slender forge
#

hahaha

placid flume
#

alright final steps now?

slender forge
#

love hate relationship with trigonometry

placid flume
#

real 😭

slender forge
placid flume
#

OMG IT'S THE ANGLE IDENTITY THING FROM BEFORE

slender forge
#

yessir

placid flume
#

with alpha being 5x beta being -5x

#

-4x

#

so that's 2sin(x/2)cos(9x/2) = 0

slender forge
#

just 4x, not -4x

#

wait its the same thing

#

its fine

placid flume
#

okok

slender forge
#

now just solve for each case

placid flume
#

YH SIN(X/2) = 0 AND COS(9X/2) = 0

slender forge
#

cos 9x/2 = 0 and sin x/2 = 0

#

yep

placid flume
#

DAMN

slender forge
#

that wasnt that hard was it

placid flume
#

ur acc insane

slender forge
#

$\frac{\pi(1+2\pi}{9}$ and $n \in \mathbb{Z}$

#

damnnit

placid flume
#

i get it tho yeah

#

solving the cases is trivial

slender forge
#

there we go

#

wait no

ocean sealBOT
#

Quantie

slender forge
#

aha!

#

DAMNIT i give up on making it pretty

#

alright so yeah

#

thats it

placid flume
#

😭

#

thanks so much

#

journey of a q

#

.close

lone heartBOT
#
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#
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Show your work, and if possible, explain where you are stuck.
After 15 minutes, feel free to ping <@&286206848099549185>.
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astral void
#

Hello! Can someone help me understand primes (no not prime numbers, but f'(X) and rate of change kind of prime numbers)? I know the answer to both of these questions is 14, but I have no idea why or how we got there.

astral void
azure needle
#

Derivative?

hushed locust
#

f'(x) means the derivative of f(x), so you first need to take the derivative

astral void
#

Sorry if this is a dumb question, but what is a derivative?

azure needle
opal lintel
azure needle
#

Yes

#

Although that's not needed

opal lintel
azure needle
astral void
#

I know rate of change is the slope between two points

sonic sedge
#

hiii

#

can someone help me with a math question

azure needle
lone heartBOT
azure needle
#

Do you know what the slope is?

astral void
#

so the slope would be 14... is that what a derivative is? I guess I'm still a little confused on what a derivative is. I know you said it is the differentiated form of an equation, but I'm not really sure what that is either :/

astral void
#

btw I really appreciate you guys helping me with this, I've been stumped for like an hour trying to figure it out by re-reading my class notes

azure needle
#

y=ax+b

#

a is the slope

#

Compare this with your question

#

@astral void

astral void
#

the equation is F(x) = 14x-16, so 14 would be the slope.

azure needle
#

Yup

astral void
#

So the derivative of a function is just the slope?

azure needle
#

Derivatives are in calc 1 or something

astral void
#

Yup, that's the class I'm in

#

Okay thanks guys! I appreciate it!

#

.close

lone heartBOT
#
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lone heartBOT
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Show your work, and if possible, explain where you are stuck.
After 15 minutes, feel free to ping <@&286206848099549185>.
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green osprey
#

this gype of graph is ocnsidered an even graph right?

green osprey
hushed locust
#

it's a graph of an even function

green osprey
#

how would I decipher that if I was given nothing

#

I understand I can split it up into e^(1+x)(1-x)

#

but how would that give me anything

hushed locust
#

given the graph, you can see it's symmetric about the y-axis
given the function definition, you can find that f(-x) = f(x)

green osprey
#

so would I sub in -x to confirm

#

oh wait

#

I see what you mean

#

so f(-x)=f(x) means even function

#

then does -f(x)=f(x) mean odd function?

hushed locust
#

odd function means f(-x) = -f(x)

green osprey
#

ok thanks

#

.close

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#
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wispy matrix
#

Graph the following system of linear inequalities.

−6x + 3y   ≤   −33
x − y   ≥   5
x   ≥   0
y   ≤   0
I was given this problem, I know it's unbounded but I can't figure out what area to shade, I'm thinking the whole thing will be since one linear inequalities is less than, and the other is greater than. Also since the bottom two linear inequalities are false do I not graph them?

wispy matrix
#

hope this helps

#

.close

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alpine sable
lone heartBOT
alpine sable
#

is this the right integral?

#

I'm not sure if I need the 9.8. pretty sure I do but taking 9.8(40,000) outside as a constant seems like a really big number

lone heartBOT
#

@alpine sable Has your question been resolved?

alpine sable
#

<@&286206848099549185>

lusty sphinx
#

Hey im trying to get some help with finding the domain on z(x)=sqrt (x/x-1). i got an answer of 0,1 U 1,infinty but im confused on what to do with the brackets rather they are open or closed brackets

alpine sable
#

@everyone im new

lone heartBOT
#

@alpine sable Has your question been resolved?

alpine stump
#

can someone help me with a finance problem

#

When you reach retirement​ age, you would like to have enough money saved to be able to​ “pay yourself” an annual salary of ​$62​,000 per year for 20 years. To put this another​ way, your plan is to start your retirement with a large amount of money​ saved, and you will withdraw ​$62​,000 from these savings once a year for the next 20 years until all of your savings are depleted.
In the​ meantime, you are a​ 25-year-old new UIC​ graduate, and you plan on working for 40 years until you retire. To fund your retirement​ goals, you plan on investing some money in the stock market. More​ specifically, at the end of each year until you​ retire, you are going to put part of your paycheck into the stock​ market; you'll put in the same dollar amount every year for the next 40 years.
You are a pretty decent stock​ investor, and you think you can make a 12​% return on the market each year you​ invest, both until you retire and after retirement.
What is the annuity payment​ (to the nearest​ dollar) you need to put into the stock market every year for the next 40 years to fully fund your​ retirement?
Write your​ answer, without a dollar sign in​ front, rounded to the nearest whole dollar. ​ (If you do this​ correctly, it might be a smaller number than​ you'd think!)

lone heartBOT
#
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candid dune
#

hey

lone heartBOT
#

Please don't occupy multiple help channels.

candid dune
#

i have a question for a math problem

charred pilot
candid dune
green shoal
#

what is your question

candid dune
#

i need to find the distance to all the points

candid dune
#

A to B

#

D to C

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B to C

green shoal
#

So do you know how to do this and need help or have never done this before

candid dune
#

well i know how to do it but im stuck with a to D

#

because D had (x,8)

#

@green shoal

green shoal
#

please get someone else I've got something that came up sorry breadpensive

candid dune
#

its alright

#

could someone help me?

charred pilot
#

For example, C is (x+12,0)

candid dune
charred pilot
#

No

#

Do you see how I got that point

candid dune
#

i dont know how sorry

#

sorry btw my english is bad

charred pilot
#

The y value is 0 because it is on the x axis

candid dune
#

my math is in french

charred pilot
#

The x value is the same distance from D as A is from B

#

The x value of A+12 is the x value of B

candid dune
#

alright alright wait

#

where is 12

charred pilot
#

14-2

candid dune
#

but why

charred pilot
#

That is how far apart B is from A considering the x value

candid dune
#

oh so how can i find the x,8

#

(x,8)

charred pilot
#

The distance formula is

\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}
ocean sealBOT
#

mari
Compile Error! Click the errors reaction for more information.
(You may edit your message to recompile.)

candid dune
charred pilot
#

You know that the distance from A to B is the same as D to C

candid dune
#

yes i know

charred pilot
#

(Since it is a rectangle)

candid dune
#

but how is D the same distance from B as A

charred pilot
#

D to C is the same as B to A

#

Find the distance from B to A

candid dune
#

alright alright

#

will do

charred pilot
#
\begin{align}
\sqrt{(x-2)^2+(8-2)^2}\\
\sqrt{x^2-4x+4+36}\\
\sqrt{x^2-4x+4+36} = \sqrt{(a-14)^2+(0+6)^2}\\
\sqrt{x^2-4x+4+36} = \sqrt{a^2-28a+14^2+36}
\end{align}
candid dune
#

i got 14,42

#

for distance to A to B

charred pilot
#

14.42?

candid dune
#

yes

charred pilot
#

What is it in exact form

candid dune
#

14,42 units

#

wait wdym

charred pilot
#

Without the decimal

candid dune
#

14

charred pilot
#

No

#

Before you calculate the decimal

candid dune
#

ohh

#

208 but with the square root

charred pilot
ocean sealBOT
candid dune
#

but can u make sure that it was the right thing that i did

candid dune
#

alright

ocean sealBOT
charred pilot
#

Okay

#

Ignore that

candid dune
#

alright

charred pilot
# candid dune alright

To find the distance from A to D, you have to find the x coordinate for D. You know that the distance formula from A to D is equal to the distance formula from B to C. Instead of putting x in the distance formula, put it in as 2+a for the A to D one and put it as 14+a for the B to C one

#

Ill check your work for the other while you set that up

candid dune
charred pilot
#
\begin{align}
\sqrt{(14-2)^2+(-6-2)^2}\\
\sqrt{144+64}\\
\sqrt{208}
\end{align}
ocean sealBOT
charred pilot
#

Instead of putting just the variable x, put 2+a for the first one

#

And 14+a for the second one

candid dune
#

oh alright

charred pilot
#
\begin{align}
\sqrt{((2+a)-2)^2+(8-2)^2}\\
\sqrt{a^2+36}\\
\end{align}
ocean sealBOT
charred pilot
#

Like that, but do 14+a for the next one

candid dune
#

so (2+a - 2)^2 + (8-2)^2

charred pilot
#
\begin{align}
\sqrt{(x-14)^2+(0+6)^2}\\
\sqrt{x^2-28x+14^2+36}\\
\sqrt{x^2-28x+160}\\
\sqrt{x^2-28x+160} = \sqrt{a^2+36}\\
x^2-28x+160 = a^2+36\\
x^2-28x+124 = a^2
\end{align}
#

Actually keep the a for one and put an x in for the other

#

So we can find what one of them equals

candid dune
#

oh

#

wait so at the moment i have (6)^2 + (2+a-2)

ocean sealBOT
charred pilot
#

This is harder than I thought it would be

candid dune
#

wait i have an idea

#

we could find the slope for A to B

#

and use it to find like the distance

#

D to C maybe

#

By replacing

charred pilot
#

You already know what D to C is

candid dune
#

14,42x right

charred pilot
#

But yes we should find the slope of the line connecting A and B and find a slope perpendicular to it

charred pilot
candid dune
#

alright

candid dune
charred pilot
# candid dune but why

To not have to intermediately round, its a good habit, exact answer, easily manipulatable

charred pilot
#
\begin{align}
\frac{-6-2}{14-2}\\
\frac{-8}{12}\\
-\frac{2}{3}
\end{align}
ocean sealBOT
charred pilot
#

That's the slope from A to B

candid dune
#

wait i did a mistake, 14,42 is the distance between A to B , thats not the slope sorry

#

oh alright thanks

#

so -2/3

charred pilot
#

Now we need to find the slope perpendicular to that

candid dune
#

so 3/2?

charred pilot
#

Yes

#

So move up 3 units from A and to the right 2 units

candid dune
#

so its A to D and B to C

charred pilot
#

x is 6

candid dune
#

oh but how did u find that

charred pilot
#

D is (6,8)

charred pilot
#

But twice

#

C is (18,0)

candid dune
charred pilot
#

Now find the last distance

candid dune
#

alright

charred pilot
# candid dune sorry to ask why so many times but why lol

Because that is how slope works, it is a change in y over a change in x. I am moving up 3 units and moving right 2 units for each interval. Since the y value for D is 6 more than the y value for A, I have to do this slope progression twice

candid dune
charred pilot
#

No

#

If I do the progression once, I will find the midpoint between the two

#

How about this, try the progression once and tell me what point you get

candid dune
#

i found 208 again

#

the square root of 208

charred pilot
#

It's not 208

candid dune
#

what is it

charred pilot
#

I haven't done it but show your work here

candid dune
#

alright so i did (x2-x1)^2 + (y2-y1)^2

#

(18-6)^2 + (0-8)^2

#

good so far or no

charred pilot
#

You found the distance from D to C

#

We already knew it was sqrt(208)

#

Find the distance from A to D

#

Which will equal the distance from B to C

candid dune
#

alright

#

is it sqrt(52)

charred pilot
#

That sounds right

candid dune
#

alright so now i have to do it times two

charred pilot
#

Do what times two

candid dune
#

after doing the square root

#

vbecause

#

i need to find the air

charred pilot
#

What?

candid dune
#

like base x height

#

oh wait no

#

i dont do times two

charred pilot
#

The area is sqrt(208)xsqrt(52)