# Math Help - What values of K?

1. ## 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.

2. the DE is exact if:

$\frac{d}
{{dx}}\left( {1 + 2x + 18y + k + kx} \right) = \frac{d}
{{dy}}\left( {2x + 5y + 5k} \right)

$

3. Done