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Math Help - solve for K to make the problem exact...

  1. #1
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    solve for K to make the problem exact...

    ok so in this problem i have to solve for K to make the problem exact, that means My = Nx. so here is the problem.

    (y^3 + kxy^4 - 2x)dx + (3xy^2 + 20x^2y^3)dy = 0

    so My= 3y^2 + 4kxy^3 and Nx=3y^2+60x^2y^2

    the answer in the book says 10, but i don't see how they got that from what i have k is not going to be a number.any help would be appreciated.

    thanks in advance.
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  2. #2
    A Plied Mathematician
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    Your Nx is incorrect. It should be 3y^2 + 40xy^3. That might clear things up a bit for you.
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  3. #3
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    wow, its the little things that cause the most grief...thanks.
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  4. #4
    A Plied Mathematician
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    Quote Originally Posted by slapmaxwell1 View Post
    wow, its the little things that cause the most grief...thanks.
    Always. Have a good one!
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