1. The problem statement, all variables and given/known data Find the volume of the solid rotated about the given axis 2. Relevant equations ∫R^2-r^2dx Disk method 3. The attempt at a solution I'm having trouble finding the limits of integration: here's my setup Pi∫(x^3+1)dx and integrated from -1 to 1. I got this by setting y=-1 equal to y=x^3 X^3=-1=-1 Then I get (16/7)pi which I believe is the right answer so can anyone tell me whether my method is correct. I'm using the disk method here.