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/sci/ - Science & Math

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1131645 No.1131645 [Reply] [Original]

/sci/, I'm taking an online take-home test for my pre-calc class...
I really need this grade and I don't know what the answer to this is.

WolframAlpha has failed on me (see: http://www.wolframalpha.com/input/?i=y%3D%28x-7%29^3%2B8+inverse ), but that is beside the point--I'd also like to know how I should solve this!

inb4no homework threads...you guys love me lol

>> No.1131661

y=(x-7)^3+8
Inverse:
x=(y-7)^3+8
x-8=(y-7)^3
cubedroot(x-8)=y-7
cubedroot(x-8)+7=y

>> No.1131669
File: 29 KB, 964x612, inverse.png [View same] [iqdb] [saucenao] [google]
1131669

>> No.1131675

To do this switch x and y in the function with each other. Now solve for y

>> No.1131684

>>1131675
Thank you so much for what I'm supposed to be doing

>>1131669
>>1131661
Thanks so much for taking the time out to actually solve it too!

I have faith in /sci/...

>> No.1131693

>>1131684
You can delete your homework thread now.

>> No.1131695

>>1131684
I don't have faith in you though lol. Google it or take some time to actually look at the beginning of your book next time.

Fuck it. You'll be back anyway. lol

>> No.1131699

>>1131684
I remember how tedious pre-calc was for me. Figured you might benefit from seeing it like it'd be drawn on the board.

>> No.1131797
File: 4 KB, 258x168, 219160.gif [View same] [iqdb] [saucenao] [google]
1131797

>>1131699
Definitely, man. I enjoy my teacher though. I'm like the only kid who pays attention and often I have discussions with him which make kids say "omg shut up already..."

now I'm like on one of the last problems, didn't need help until now...

is this question missing some numbers? it only gives me one...where is I?

>> No.1131833

Just bumping this thread once. Don't get mad, guys.

>> No.1131859

>>1131645
>>1131645
Man, can it get any easier?
http://www.purplemath.com/modules/invrsfcn3.htm

>> No.1132269

If the inverse of a function y=f(x) is x=f(y) with x and y switched, Here's my stab at it:

y=(x-7)^3 + 8

y-8=(x-7)^3

CBRT(Y-8)=x-7

CBRT(Y-8)+7 = x

switching x and y

y=CBRT(y-8) + 7

>> No.1132306

The answer is C.