In this video, Salman Khan of Khan Academy explains polynomial approximation of functions. Part 7 of 7.
Khan Academy

In this video, Salman Khan of Khan Academy explains polynomial approximation of functions. Part 6 of 7.
Khan Academy

In this video, Salman Khan of Khan Academy explains polynomial approximation of functions. Part 4 of 7.
Khan Academy

In this video, Salman Khan of Khan Academy explains polynomial approximation of functions. Part 3 of 7.
Khan Academy

In this video, Salman Khan of Khan Academy explains polynomial approximation of functions. Part 2 of 7.
Khan Academy

In this video, Salman Khan of Khan Academy explains polynomial approximation of functions. Part 1 of 7.
Khan Academy

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

Some worked example problems that point out many common errors students make when solving them.
Pauls Online Math Notes

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

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