# Solving a Cubic via the Trisection of an Angle

Solving a Cubic via the Trisection of an Angle

This Demonstration shows a geometric solution to the equation , where and are real in the case where the equation has three distinct real roots (i.e. has a positive discriminant). It is based on Viète's trigonometric solution of the cubic that constructs and trisects a particular angle associated with the given cubic equation.

x+px+q=0

3

p

q