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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the DE is exact if: $\displaystyle \frac{d} {{dx}}\left( {1 + 2x + 18y + k + kx} \right) = \frac{d} {{dy}}\left( {2x + 5y + 5k} \right) $
Done
Last edited by kbartlett; May 3rd 2008 at 02:06 PM.
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