Homework Help: Calculus

Posted by Cindy on Friday, October 26, 2012 at 8:05pm.

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis.
y=x^2,x=y^2 about the axis x=–7

Calculus - Steve, Friday, October 26, 2012 at 8:33pm
using discs (washers)

v = ∫[0,1] π(R^2-r^2) dy
where R = 7+√y and r = 7+y^2
v = π∫[0,1] (7+√y)^2 -(7+y^2)^2) dy
v = 149π/30

using shells
v = ∫[0,1] 2πrh dx
where r = 7+x and h = √x-x^2
v = 2π∫[0,1] (7+x)(√x-x^2) dx
v = 149π/30

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