Cubic equations

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A [univariate] cubic equation is a [univariate] polynomial equation of degree 3, i.e.

$ax^{3}+bx^{2}+cx+d=0,\quad a\neq 0.\,$

Cubic formula

Main article page: Cubic formula

The general cubic, being of degree lower than 5, is solvable. Cardano published a formula to solve the general cubic in 1545.

See also

• Quadratic equations
• Biquadratic equations