calculus | Mathematics | Page 1

hot coral May 4, 2023, 4:10 PM

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lyric solarBOT May 4, 2023, 4:10 PM

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hot coral May 4, 2023, 4:10 PM

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tried this problem like 10 times

crystal haven May 4, 2023, 5:03 PM

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I suggest is doing all of these separately and changing some of the variables away from x to other variables to avoid any confusion

hot coral May 4, 2023, 5:03 PM

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crystal haven I suggest is doing all of these separately and changing some of the variables aw...

yeah thats what I did obviously

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but im stuck on the second bracket

crystal haven May 4, 2023, 5:05 PM

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Do you know about l'hopital's rule

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We're lim(f(x)/g(x))=lim(f'(x)/g'(x))

hot coral May 4, 2023, 5:06 PM

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ok lemme try it rq

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ok its gonna be = -7 using that rule

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what about the last part

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the summation

crystal haven May 4, 2023, 5:08 PM

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Are you shur it is -7 I got a different answer

hot coral May 4, 2023, 5:09 PM

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can u show me

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maybe im doing it wrong

crystal haven May 4, 2023, 5:10 PM

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Give me a sec and I will

hot coral May 4, 2023, 5:10 PM

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okay

crystal haven May 4, 2023, 5:12 PM

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I might take a little while longer I'm in the middle of class lol

hot coral May 4, 2023, 5:19 PM

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okay

crystal haven May 4, 2023, 5:47 PM

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hot coral May 4, 2023, 5:48 PM

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ok so 7?

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not far off from waht i did

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can u help me with the summation

crystal haven May 4, 2023, 5:50 PM

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I think when you did the dirivtive of 1+7((e^-x)-1) you got 7e^-x when it should be -7e^-x

hot coral May 4, 2023, 5:50 PM

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crystal haven I think when you did the dirivtive of 1+7((e^-x)-1) you got 7e^-x when it should...

yah im still learniing calculus so

crystal haven May 4, 2023, 5:51 PM

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Just rember the diritive of e^-x=-e^-x

hot coral May 4, 2023, 5:52 PM

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thanks

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but what about the infinite sum :p

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those things look scary

crystal haven May 4, 2023, 5:55 PM

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Well for a infinit geometric sires there is a simple formula

hot coral May 4, 2023, 5:56 PM

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yahhh i remember that

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wasnt it liek 1+r/a or something

crystal haven May 4, 2023, 5:57 PM

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For a infinit summation starting from 0 if the commen ratio is below 1 it is 1/(1-r)
If it starts at a Differenct number like a it's a/(1-r)
We're r is the commen ratio

hot coral May 4, 2023, 5:58 PM

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ok so here we use the first rule no?

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cuz r is 16/17

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whic hsi less than zero

crystal haven May 4, 2023, 5:59 PM

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We do it so the summation is 1/(1+16/17)

hot coral May 4, 2023, 5:59 PM

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= 17

crystal haven May 4, 2023, 5:59 PM

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Yes

hot coral May 4, 2023, 5:59 PM

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so doing the whole thing

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wait

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1034

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🫡

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ty

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.solved

lyric solarBOT May 4, 2023, 6:00 PM

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Solved

Post marked as solved by @hot coral.

Use .unsolved if this was a mistake.

crystal haven May 4, 2023, 6:02 PM

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Umm it's not 1034

hot coral May 4, 2023, 6:02 PM

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wait wut?

crystal haven May 4, 2023, 6:02 PM

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You added 17 when you should of subtracted

hot coral May 4, 2023, 6:02 PM

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4*5-7+17?

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ohh

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HAHAHA

crystal haven May 4, 2023, 6:03 PM

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There are parentheses around the 7 and 17 so it's 4^5-(7+17)

hot coral May 4, 2023, 6:03 PM

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1000?

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so funny

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thanks bud

crystal haven May 4, 2023, 6:03 PM

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Np

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Allso imagen being helped by a highschooler lol

hot coral May 4, 2023, 6:16 PM

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crystal haven Allso imagen being helped by a highschooler lol

im a high schooler too 😄

crystal haven May 4, 2023, 6:17 PM

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Oh what grade

hot coral May 4, 2023, 6:20 PM

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crystal haven Oh what grade

grade 11

crystal haven May 4, 2023, 6:22 PM

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Imagen being helped by a freshman lol (9th grade)

hot coral May 4, 2023, 6:22 PM

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ur smarter than me

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i hope u do well in life :

#calculus