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Math Help - Integrals - Volume AGAIN

  1. #1
    Member Awsom Guy's Avatar
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    Integrals - Volume AGAIN

    Hello.
    Question:
    Show that y=2sqrt(1-x^2) and y=sqrt(1-x^2) intersect at (1,0)and (-1,0). Find the volume of the solid when the enclosed region is rotated.
    A) about the y-axis.
    I already calculated the x-axis and I got it right.

    My attempt:
    I don't know how to use the program and insert the cool f's and stuff.
    so I will skip that bit
    pi(-(2)^3/12 +2) - pi(-(1)/5) + 1)
    pi(-(4/3) - pi(4/5)

    My answer is way wrong please help me.
    Thanks
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  2. #2
    MHF Contributor
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    Quote Originally Posted by Awsom Guy View Post
    I don't know how to use the program and insert the cool f's and stuff.
    so
    ... so, explain your steps in words, at least. E.g. I said, 2 pi times the int from zero to 2 of the following...

    Otherwise we can't see where you took a wrong turn and we'll end up spoiling your fun
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