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Find the volume of the solid obtained by rotating the region

bounded by the given curves about the specified line. Sketch the

region, the solid, and a typical disk or washer.

y^{2}= x; x = 2y; about the y-axis

Solution: http://www.slader.com/textbook/9780...-transcendentals-7th-edition/438/exercises/9/

Now, when I solved the question, I multiplies the entire integral by 2 since the limits I took were from -2 to 2. However, in the answer, they have considered only the values above the x-axis and not below. Why is it so? It doesn't specify in the question that we need to find the area of only that region which lies above the x-axis.

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# I Should we consider negative axis when finding the volume?

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