CORRECTION: 0:35 should say "intersects y = 0"!
A proof of the quadratic formula and its implications. Hope you enjoy, feedback is appreciated!
Chapters:
0:00 Introduction
0:54 History of the Quadratic Formula
1:52 Solving the General Quadratic Equation
3:42 Interpreting the Quadratic
4:57 The Broader Problem of Factoring Polynomials
6:04 Motivating Abstract Algebra/ End