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Math Help - Find the volume of the solid obtained by rotating the region enclosed by

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    Find the volume of the solid obtained by rotating the region enclosed by

    Find the volume of the solid obtained by rotating the region enclosed by
    y = (x^2) − 1, y = 2x − 1 about y = 4 .
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    find the imits of integration ...

    x^2-1 = 2x-1

    x^2 - 2x = 0

    x(x-2) = 0

    x = 0 ... x = 2

    using the method of washers ...

    R(x) = 4 - (x^2-1)

    r(x) = 4 - (2x-1)

    V = \pi \int_0^2 [R(x)]^2 - [r(x)]^2 \, dx
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