Khan Academy

Solving quadratics by factoring Video (K-A)

Quadratics by taking square roots: with steps (K-A)

Solving quadratics by factoring: leading coefficient ≠ 1 (K-A)

Solving quadratics by taking square roots examples (K-A)

Solving quadratics using structure (K-A)

Solving quadratics by taking square roots Notes (K-A)

Solving quadratics by taking square roots Video (K-A)

Solving quadratics by taking square roots: strategy (K-A)

Solving simple quadratics review Notes (K-A)

Discriminant review (K-A)

Proof of the quadratic formula (K-A)

Quadratic formula proof review (K-A)

Quadratic formula review (K-A)

The quadratic formula Video (K-A)

Understanding the quadratic formula (K-A)

Using the quadratic formula (K-A)

Using the quadratic formula: number of solutions (K-A)

Worked example: quadratic formula (example 2) (K-A)

Worked example: quadratic formula (K-A)

Worked example: quadratic formula (negative coefficients) (K-A)

Intro to parabola transformations (K-A)

Scaling & reflecting parabolas (K-A)

Shifting parabolas (K-A)

Classifying numbers: rational & irrational (K-A)

Intro to rational & irrational numbers (K-A)