Example 4: Factoring quadratics by taking a negative common factor and grouping | Khan Academy
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Factor -12f^2-38f+22 as -2(2f-1)(3f+11).
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https://www.khanacademy.org/math/algebra2/polynomial_and_rational/quad_factoring/e/factoring_polynomials_by_grouping_1?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/factoring-trinomials-by-grouping-5?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraII
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