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Factoring, completing the square, and the quadratic formula.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

A review of the three major methods of solving quadratic functions for ''x'' intercepts.
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This lesson applies factoring a quadratic equation to other types of polynomials that are in "quadratic form."
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• PLIX

Methods for Solving Quadratic Functions: Boxes for Factoring

Methods for Solving Quadratic Functions Interactive
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Learn how to solve quadratic equations by using factoring in this step-by-step video with several example problems.
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• Video