CK-12 Foundation
Ck 12: Algebra: Factor Quadratics: Factorization of Quadratic Expressions
[Free Registration/Login may be required to access all resource tools.] Learn how to factor quadratic expressions. Includes examples, videos, review exercises, and a quiz.
OnlineMathLearning.com
Online Math Learning: Factor Polynomials With Complex Roots
A collection of video lessons with example problems and solutions to help students learn how to extend polynomial identities to the complex numbers. Includes interactive widget for working on the modeled problems or trying your own.
Help Algebra
Help algebra.com: Factoring Polynomials
A detailed description of how to factor several types of polynomials is presented. Examples are provided to demonstrate the process.