University of Colorado
University of Colorado: Ph Et Interactive Simulations: Curve Fitting
Drag data points and their error bars, and watch the best-fit polynomial curve update instantly. Choose the type of fit: linear, quadratic, cubic, or quartic. The reduced chi-square statistic shows when the fit is good.
Purple Math
Purplemath: Polynomials: Definition and Evaluation
A great lesson on polynomials is found at this Purplemath resource. Provides a clear definition of what a polynomial is, tells how to tell what the different degrees of a polynomial are, and how to simplify polynomials by combining like...
Math Medics
S.o.s. Math: The Quartic Formula
This lesson provides information on the quartic formula. Examples are provided with answers.