Find the set of real values k, k ≠ -1, for which the roots of the equation x2 + 4x - 1 + k(x2 + 2x + 1) = 0 are complex with positive real part.
So far, I have found the discriminant of the equation and solved for k when Δ < 1, giving me k < -5/4. But this is only the complex(?) part of the solution. How do I find the "positive real part"?