I've been working through the book The Story of i(sqrt of -1). It's kinda like a story with a lot of Math. The first 2 chapters deal with cubics and geometry for solving cubics functions. I understand the algebra behind it but I'm getting lost with the big picture. I need a supplemental book or papers to help me along. Any recommendations? Also, what branch of Math would I find these ideas in? It's pretty heavy Algebra mixed with Geometry. Thanks.