http://www.youtube.com/embed/jyYcWib68CY

A cubic equation can have 3 real roots or 1 real root and a complex conjugate pair. In this video I show you how through the graphs of cubic equations. I then show you how to solve cubic equations that have complex roots by looking at this example:

  • Find all the roots of the equation 

You are then given this question to try.

  • Find all the roots of the equation