- #1
tolove
- 164
- 1
Homework Statement
Find the volume of the solid generated by revolving the region between the parabola x = y^2 + 1 and the line x = 3 about the line x = 3.
Homework Equations
The answer is found by integrating with respect to y with disk method, but I don't understand why my answer is incorrect when I try to integrate it with dx.
The Attempt at a Solution
The exact answer when integrated with respect to y is 64*pi*√(2)/15.
This is the integral I am incorrectly setting up somehow:
2*∫ pi * (√(x-1))^2 dx, x = 1 to 3
Any ideas why this doesn't work?