Posted by Monique on .
How do find the inverse function for this problem:
f(x) = (x+3)^2, x is greater than or equal to 3
I know the first thing you do is switch the variables, so it looks like this:
x = (y+3)^2
Then expand:
x = y^26y9
And solve for y:
x + 9 = y^26y
I get a little confused after that with y. Help please? Thank you very much!

Math (repost) 
Marth,
At the step where you have x = (y+3)^2, you should take the square root of both sides.
sqrt(x) = (y+3)
sqrt(x) = y+3
sqrt(x)  3 = y