Before today I'd never actually solved a cubic equation, at least not algorithmically, but I saw it in a book today so I thought why not sit down and teach myself it, and write a primer. Feedback would be appreciated, thanks.
You may also want to look at the math books of the late Dr. Lancelot Hogben. Very valuable for all ages and all levels of understanding. I have some book lists at my forum that point to him, among other great minds.