Khan Academy on a Stick

Parabola vertex and axis of symmetry

Parabola vertex and axis of symmetry

Graphing quadratics

Graphing a parabola with a table of values
Parabola vertex and axis of symmetry
Graphing a parabola by finding the roots and vertex
Finding the vertex of a parabola example
Multiple examples graphing parabolas using roots and vertices
Graphing a parabola using roots and vertex
Graphing a parabola in vertex form
Parabola Focus and Directrix 1
Focus and Directrix of a Parabola 2
Using the focus and directrix to find the equation of a parabola

If the above player doesn't work, you can try this direct link.

All Khan Academy content is available for free at www.khanacademy.org.
This collection was created August 2013.