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Math Help - Find Constant of Intergration

  1. #1
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    Find Constant of Intergration

    (x^2+1)^2 dy + 20x dx = 0

    Find Constant of Integration 'C' ,when x = 2 and y =7.

    Any help appreciated.
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  2. #2
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    Find Constant of Intergration-img_0002.jpg
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  3. #3
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    Thanks very much for that ,
    just a Quick Question you have a '-10' in front of the intergrand and then it diappears in the following line ,just wondering how that is the case.
    The neg sign I mean
    thanks again
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  4. #4
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    Remember:
    [{1/f(x)}]'=-{f(x)}'/f(x)^{2}.So here:
    [{10/(x^{2}+1})]'=10*[-2x/(x^{2}+1)^{2}]
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