(1) Find the inverse of the linear function
f(x) = mx + b, m does not = 0.
(2) Find the inverse of the function
f(x) = sqrt{r^2 - x^2}, 0 < or = to x < or = to r
Interchange the x and y. Then, solve for y.
Actually, Earboth did a good job of explaining this one here: http://www.mathhelpforum.com/math-he...functions.html
And yes, you take the square root of both sides. The inverse is the same as the original function.