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Math Help - Double Integral help

  1. #1
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    Cool Double Integral help

    Please view the attached.

    What ive done:

    (-1, 2)
    (1, 2) are the intercepts.

    my integral has dy then dx.
    1top -1bottom on the outside integral.
    (x^2 + 1)top (2x^2)bottom on the inside integral.


    ****

    So i got 8/15 units^2 just wondering if this is right, if not pls help.
    Attached Thumbnails Attached Thumbnails Double Integral help-maths12345.png  
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  2. #2
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    Re: Double Integral help

    Hey Brennox.

    One method for future ref erence to check symbolic calculations is to use Wolfram Alpha which is a symbolic computational engine. You should put your integral in there to see how it turns out:

    Wolfram|Alpha: Computational Knowledge Engine

    This is especially useful if you can't find someone quick enough.
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  3. #3
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    Re: Double Integral help

    Quote Originally Posted by Brennox View Post
    Please view the attached.

    What ive done:

    (-1, 2)
    (1, 2) are the intercepts.

    my integral has dy then dx.
    1top -1bottom on the outside integral.
    (x^2 + 1)top (2x^2)bottom on the inside integral.


    ****

    So i got 8/15 units^2 just wondering if this is right, if not pls help.
    I agree with your bounds. I don't agree with your final answer. Unless you post all your working, I can't see where you've gone wrong.
    Thanks from topsquark
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  4. #4
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    Re: Double Integral help

    Quote Originally Posted by Prove It View Post
    I agree with your bounds. I don't agree with your final answer. Unless you post all your working, I can't see where you've gone wrong.
    okay i got it arithmatic error, can you have a look at this other question please

    Line integral Question
    Last edited by Brennox; November 10th 2013 at 12:23 AM.
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  5. #5
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    Re: Double Integral help

    did you get 16/15? it's really an easy integral
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  6. #6
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    Re: Double Integral help

    I got 16/15 as well.
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  7. #7
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    Re: Double Integral help

    Bi viết hay!

    Ruột bt Montblanc chnh hng tại Việt Nam - 400 Trần Hưng Đạo, P.2, Q.5, Tp.Hồ Ch Minh Thứ 2 - 7 : 8:00am - 5:30pm Cc sản phẩm ruột bt Montblanc bao gồm: ballpoint, fineliner, mozart v rollerball.
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  8. #8
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    Re: Double Integral help

    I'm curious how one visualizes a 4 dimensional object for a quadruple integral where the planes are 3d surfaces- like you can it seems deduce properties of a 4D cube.
    there was an interesting amplituhedron discovery lately in 4 dimensions
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