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This How to Use the Quadratic Formula, Polynomial and Rational Functions, Algebra II instructional video also includes:
It's the video your algebra class has been waiting for - Sal explains the quadratic formula! He describes it as "one of at least the top five most useful formulas in mathematics" and recommends that it be memorized, provided one also remembers how to prove it. The rest of the video contains several clear and helpful applications of the formula in quadratic equations.
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