This video includes sample exercises and stepbystep explanations of shifting quadratic graphs and finding xintercepts (roots) for the California Standards Test.
Khan Academy

A helpful scientific calculator that runs in your web browser window.
Holt Online Learning

In this video, Salman Khan of Khan Academy explains completing the square.
Khan Academy

This video includes sample exercises and stepbystep explanations of solving quadratics and graph shifts for the California Standards Test.
Khan Academy

Excellent site showing examples of algebra, trig, calculus, differential equations, and linear algebra.
Paul's Online Math Notes

How to solve quadratic equations using the completing the square method.
SOS Math

Quiz on Quadratic Equations and Applications and Inequalities
SOS Math

Online graphing calculator, useful for drawing out a function to visualize it or find key points.
http://www.coolmath.com

Interactive tutorial and explanation involving qudratic functions (graphing and equations).
Analyze Math

How to solve quadratic equations using the quadratic formula
SOS Math
