solved

[cinder needle]

i have the roots of it but the website doesn't like the way i wrote the equation after completing the square

(x-1.5)^2=x^2-3x+2.25

x^2-3x+2.25-20.25=x^2-3x-18

(x-1.5)^2-18=0

which is wrong

i got (x-3/2)^2=81/4

which is also apparently wrong

[frosty trout]

or use the formula

[cinder needle]

i have both of the roots

its asking me for the equation after completing the square

which is something im confused about

@frosty trout

[frosty trout]

so it has to be like blah^2

right

[cinder needle]

(x-3/2)^2=81/4

this is what i got

but it says it's wrong

[cinder needle]

when you solve the equation you get x^2-3x-18=0

[frosty trout]

shouldnt you just unsquare it

its like 9/2

i think you re doing right

(・Д・)

[cinder needle]

i don't think so

you can't get (x^2-3x-18) just by squaring a number

i think you have to add/subtract it at the end

i don't know 😭

[frosty trout]

whats the original question

[cinder needle]

solve the equation x^2-3x-18=0 by completing the square

i solved it right i just

wrote the wrong thing

ruaah thanks for your help @frosty trout

[frosty trout]

😄

[cinder needle]

wait real quick

whats your method for quickly finding the factors

[cinder needle]

like the sets of numbers you wrote in the red

[frosty trout]

oh

[cinder needle]

i know the numbers have to add to one and multiply to the other

[frosty trout]

ill write it out

[cinder needle]

but is there like a shortcut

that you use

[frosty trout]

its not really a short cut but you can just do it in mind

[cinder needle]

you can?

[frosty trout]

You see the last number as a times b

And use the sign before to add or subtract one from each other

And see the sum thing equals to the number before x

Not x^2

[cinder needle]

so how would you quickly solve

like

[frosty trout]

Yea

[cinder needle]

(x^2+10x-2184=0)

its factorable

[frosty trout]

Need a bit time if its too big

[cinder needle]

its 52-42

okay scratch that

[cinder needle]

so in x^2-3x-18, -18 would be viewed as timed b

and you would use the sign from x to subtract -3 and -18 from each other?

[frosty trout]

Using those number which made up 2184

And try to make two numbers that will get 10

After subtracting

[cinder needle]

how did you get 7 191/13

?

[frosty trout]

Its called long division

[cinder needle]

yeah i

yeah

im

yeah

and you got the number at the bottom from

[frosty trout]

use the prime number that can use to devide and move on to the next when the previous is undecidable

Devidable

[cinder needle]

where did you learn that from

[frosty trout]

Our school???

[cinder needle]

like

which math class

[frosty trout]

You guys dont learn it that way??

Elementary

Where are you from

[cinder needle]

are you talking about the division or the factoring

we long divide differently

america

oops

[cinder needle]

we don't divide it like that

[frosty trout]

The way to long divide

Oo im from china maby our teacher taught differently

[cinder needle]

yeaah education in america is

like

lower

than literally everywhere else

[frosty trout]

Poor bud

Have fun with math

[cinder needle]

literally

alright ill figure it out

i don't know how to close the problem

-close

post

[mossy wing]

solved

[frosty trout]

Buh bye

[nova wasp]

.solved