Proving the Quadratic Formula - Twice (Precalculus - College Algebra 20)

Using the Quadratic Formula (Precalculus - College Algebra 21)

Completing the Square Made Easy (Precalculus - College Algebra 19)

How to use the quadratic formula | Polynomial and rational functions | Algebra II | Khan Academy

Graphing Quadratic Functions (Precalculus - College Algebra 24)

Math Olympiad tricks. Alternative Quadratic formula proof.

Using Factoring to Solve Quadratics (Precalculus - College Algebra 18)

Synthetic Division and Long Division of Polynomials (Precalculus - College Algebra 32)

Graphs You Must Know (Precalculus - College Algebra 13)

The Square Root Method in Solving Quadratics (Precalculus - College Algebra 17)

Finding Intersections of Functions (Precaluclus - College Algebra 22)

Using Substitutions to Solve Equations (Precalculus - College Algebra 23)

Creating Polynomials from Complex Solutions (Precalculus - College Algebra 36)

Introduction to Quadratic Theory (1 of 2: Why we care about quadratics)

I visited the world's hardest math class

Solving Quadratic Inequalities (Precalculus - College Algebra 25)

Proof Position and Velocity Vectors Are Perpendicular in Circular and Spherical Motion

How to Evaluate Functions (Precalculus - College Algebra 3)

Limits at Infinity & Horizontal Asymptotes

Deriving the Quadratic Formula

Finding ALL Solutions of Polynomials (Precalculus - College Algebra 37)