Posted by Shawn on .
Find the formula for the inverse of each funtion.
3.) f(x)= 2x5 for this one I have
y= (x+5)/2 is this correct?
4.) g(x)= (x+5)^3
I am stuck on this one.

Algebra inverse 
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) 
Algebra inverse question 
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 
Algebra inverse question 
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)