How does one solve a cubic polynomial with complex coefficients? I have found formulas online for the the roots of a cubic polynomial with real coefficients, but they all said this they would not work for polynomials with complex coefficients.  I need to solve the following:
$x^3+cx^2+\alpha$ where $c>0$ and $\alpha\in\mathbb{C}$.  Anyone have the formula

As Moron says, Cardano works. You merely need to be a bit more careful than usual.
