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s3a
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Homework Statement
Problem:
Find the volume of the solid of revolution obtained by rotating the area bounded by the curves y = x^2 – 2 and y = 0 about the line y = -1. Consider only that part above y = -1.
Solution:
The solution is attached as TheSolution.jpeg.
Homework Equations
Integration.
The Attempt at a Solution
I get everything the solution did except for the part with the PQ = 1 - |y| = 1 - (-y) = 1 + y = y + 1.
Could someone please explain that part for me?
Any input would be greatly appreciated!