Cubic Equation Solver

Cubic equation solver: real and complex roots of ax³ + bx² + cx + d = 0 using Cardano’s and the trigonometric method, with the discriminant.

ax³ + bx² + cx + d = 0

How to use this calculator

  1. Type your input in the box.
  2. The result updates as you type.
  3. Use “Copy result” or “Copy link” to share it.

A cubic always has at least one real root. If the discriminant is positive there are three distinct real roots; if negative, one real and two complex.

Frequently asked questions

x³ − 6x² + 11x − 6 = 0?

x = 1, 2 and 3.

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