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Khan Academy
Khan Academy: Factoring Quadratics Intro
Factor quadratics of the form x squared+bx+c. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Other
Interactive Algebra: Factoring, Lesson 2 2
Practice factoring trinomials with these randomly generated problems. Stuck on finding the right factors? Hints are available, as well as the answer. Continue practicing until you feel comfortable factoring.