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Math Help - Volume (Integral)

  1. #1
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    Volume (Integral)



    Solution:
    y = -2
    (-2)^2 = x
    x = 4
    y^2 = +- 2
    the point of intersection should be (0,0) and (4,2)

    now im using the cylindrical method in obtaining the volume
    V = 2\pi\int_{0}^{4} R dA
    where dA = (y2-y1)dx
    for
    y2 = sqrt(x)
    y1 = x
    and
    radius be r = x+2 since the revolved line is at the 2nd quadrant and x in the 1st quadrant and it needs to be added

    V = 2\pi\int_{0}^{4} (x+2) (y_2 - y_1) dx
    V = 2\pi\int_{0}^{4} (x+2) (\sqrt{x} - x) dx
    V = -(416/15)pi ????
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  2. #2
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    Re: Volume (Integral)

    really hard to see your tiny image
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  3. #3
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    Re: Volume (Integral)

    Quote Originally Posted by skeeter View Post
    really hard to see your tiny image
    im done editing
    hope someone replies

    edit
    wut was this sarcasm?
    i posted as an image so that other students in my class will not google this question
    i want to resize the pic hoewer something might go wrong with the image and im in a hurry
    Last edited by MathMinors; December 21st 2011 at 06:37 AM.
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  4. #4
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    Re: Volume (Integral)

    Quote Originally Posted by MathMinors View Post
    im done editing
    hope someone replies

    edit
    wut was this sarcasm?
    i posted as an image so that other students in my class will not google this question
    i want to resize the pic hoewer something might go wrong with the image and im in a hurry
    no sarcasm at all ... the image is so small that one cannot read it.

    why is it so important to keep others from seeing the question?
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  5. #5
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    Re: Volume (Integral)

    Quote Originally Posted by skeeter View Post
    no sarcasm at all ... the image is so small that one cannot read it.

    why is it so important to keep others from seeing the question?
    Probably so that his/her lecturer doesn't find out that he/she's seeking help for this assessment...
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  6. #6
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    Re: Volume (Integral)

    Quote Originally Posted by Prove It View Post
    Probably so that his/her lecturer doesn't find out that he/she's seeking help for this assessment...
    Maybe, maybe not ... in any case, something's not right. Thread closed.
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