Khan Academy

Solving quadratics by taking square roots (K-A)

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

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

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

Graphing quadratics in factored form (K-A)

Parabolas intro (K-A)

Quadratic word problems (factored form) (K-A)

Graphing quadratics: vertex form (K-A)

Quadratic word problems (vertex form) (K-A)

Vertex & axis of symmetry of a parabola (K-A)

Vertex form introduction (K-A)

Finding features of quadratic functions (K-A)

Finding the vertex of a parabola in standard form (K-A)

Forms & features of quadratic functions (K-A)

Completing the square (K-A)

Graphing quadratics: standard form (K-A)

Solving quadratics by completing the square (K-A)

Quadratic word problem: ball (K-A)

Solving quadratics by completing the square: no solution (K-A)

Worked examples: Forms & features of quadratic functions (K-A)

Worked example: Completing the square (intro) (K-A)

Worked example: completing the square (leading coefficient ≠ 1) (K-A)

Worked example: Rewriting expressions by completing the square (K-A)

Proof of the quadratic formula (K-A)

Worked example: Solving equations by completing the square (K-A)