The volume of the solid obtained by rotating the region bounded by y=(x^2), y=3x  about the line y=9 can be computed using cylindrical shells via an integral  V=∫_______________dy (with lower limit of alpha and upper limit of beta) with limits of integration alpha=0 and beta=9  P.S. I have already asked this question but the given answer of  V=∫(2pi)(y-9)(sqrt(y)-(y/3)) is incorrect.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter9: Surfaces And Solids
Section9.3: Cylinders And Cones
Problem 6E: Suppose that r=12 cm and h=15 cm in the right circular cylinder. Find the exact and approximate a...
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The volume of the solid obtained by rotating the region bounded by

y=(x^2), y=3x 

about the line

y=9

can be computed using cylindrical shells via an integral 

V=∫_______________dy

(with lower limit of alpha and upper limit of beta)

with limits of integration alpha=0 and beta=9 

P.S. I have already asked this question but the given answer of 

V=∫(2pi)(y-9)(sqrt(y)-(y/3)) is incorrect. 

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