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Math Help - Determine the Area of surface when y = 2 Sqrt x is rotated about the y axis [attempt]

  1. #1
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    Determine the Area of surface when y = 2 Sqrt x is rotated about the y axis [attempt]

    Hello guys the problems is to determine the area of y = 2 Sqrt X when it is rotaded about the y axis, you can see my progress in my uploaded paper.

    I would need some help finishing it.

    see uploaded paper:

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  2. #2
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    Quote Originally Posted by Riazy View Post
    Hello guys the problems is to determine the area of y = 2 Sqrt X when it is rotaded about the y axis, you can see my progress in my uploaded paper.

    I would need some help finishing it.

    see uploaded paper:

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    complete the square
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  3. #3
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    could you show me how?
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  4. #4
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    Quote Originally Posted by Riazy View Post
    could you show me how?
    integrate Sqrt[x^2 + x] - Wolfram|Alpha

    Click on Show steps.

    But the above is pointless since you are not using the correct formula for finding the surface (should be dx/dy NOT dy/dx inside the square root).
    Last edited by mr fantastic; March 9th 2011 at 03:20 AM.
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