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Quadratic formula (proof) | Quadratic equations | Algebra I | Khan Academy
Deriving the quadratic formula by completing the square. Watch the next lesson: https://www.khanacademy.org/math/algebra/quadratics/quadratic_odds_ends/v/ca-algebra-i-quadratic-equation?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraI Missed the previous lesson? https://www.khanacademy.org/math/algebra/quadratics/quadratic_odds_ends/v ...
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