Cubic Equation

The cubic equation has the form ax3 + bx2 + cx + d = 0. Online calculator allows you to set coefficients in the corresponding fields a, b, c, d and after calculation, get three values X1, X2, X3.

Without the help of a script, you will have to perform quite complex calculations using the Cardano method, which includes at least 6 steps. The calculation begins with reducing the original equation to the form y³ + py + q = 0, etc.

Solving cubic equations is in demand when solving many fundamental and applied mathematical, physical, statistical, research, and engineering problems.


ax3 + bx2 + cx + d = 0
x³ + x² + x+ d = 0
X1:        i
X2:        i
X3:        i