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Math Help - What values of K?

  1. #1
    Junior Member
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    What values of K?

    For what values of k is the following differential equation exact?
    ( 1+2 x+18 y+k+xk )dy/dx + 2 x+5 y+5 k = 0.
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  2. #2
    Senior Member Peritus's Avatar
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    the DE is exact if:


    \frac{d}<br />
{{dx}}\left( {1 + 2x + 18y + k + kx} \right) = \frac{d}<br />
{{dy}}\left( {2x + 5y + 5k} \right)<br /> <br />
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  3. #3
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    Done
    Last edited by kbartlett; May 3rd 2008 at 03:06 PM.
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