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Khan Academy
Khan Academy: Algebra: Extraneous Solutions to Radical Equations
Video solving a radical equation that results in a quadratic equation and yields an extraneous solution. Explains how the extraneous solution appeared. [11:10]
Khan Academy
Khan Academy: Algebra: Extraneous Solutions to Rational Equations
A step-by-step demonstration on how to solve a rational equation and eliminate any extraneous solutions. [3:03]