Asked by Shawn

Find the formula for the inverse of each funtion.
3.) f(x)= 2x-5 for this one I have
y= (x+5)/2 is this correct?

4.) g(x)= (x+5)^3
I am stuck on this one.

Answers

Answered by Reiny
3 is good

4:
let y = (x+5)^2
interchange x with y
x = (y+5)^2
+-sqrt(x) = y+5

y = -5 +-sqrt(x) or f(x) = -5 +-sqrt(x)
Answered by Shawn
Hi Reiny,
I just have one question for 4.) the problem is g(x)= (x+5)^3

how were you able to convert the equation to the following?
let y = (x+5)^2
interchange x with y
x = (y+5)^2
Answered by Reiny
my error, did not read the question carefully enough, thought it was squared instead of cubed.

so just change the sqrt to cube root and use only the positive sign.

so last line should be
y = -5 +-cuberoot(x)


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