Here is a PDF version of a math problem I recently created. You’ll have to know how to factor cubic polynomials, so you may want to brush up on that first, or use this problem as a refresher. Just click on the link below to open it up. If you get stuck, a full solution starts on the second page.*
* I know I’m being lazy here not writing the problem directly in the post, but it would take at least an hour’s work to insert all the LaTeX bits and to align things. Most browsers come with a PDF viewer, right ;-)?