Posted by Shawn on Sunday, November 30, 2008 at 9:39pm.
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, Sunday, November 30, 2008 at 9:45pm
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, Sunday, November 30, 2008 at 9:51pm
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, Monday, December 1, 2008 at 12:34am
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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