Recognizing a perfect square quadratic | Algebra II | Khan Academy
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https://www.khanacademy.org/math/algebra2/polynomial_and_rational/quad_factoring/e/solving_quadratics_by_factoring?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraII
Watch the next lesson: https://www.khanacademy.org/math/algebra2/polynomial_and_rational/quad_factoring/v/factoring-trinomials-with-a-common-factor?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraII
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https://www.khanacademy.org/math/algebra2/polynomial_and_rational/quad_factoring/v/example-1-solving-a-quadratic-equation-by-factoring?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraII
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