# Math Help - washer method

1. ## washer method

Find the volume of the solid formed by revolving the region under the graph of
f(x)=9-x^2 for 0<x<3 about the line x=-2 using the washer method.

2. $\pi \int_{f(0)}^{f(3)} (f^{-1}(x))^2dx - \pi \int_{f(0)}^{f(3)} (2)^2dx$

3. whatd is f^-1(x) derivative?