Example: Complex roots for a quadratic | Algebra II | Khan Academy
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Complex Roots from the Quadratic Formula
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https://www.khanacademy.org/math/algebra2/polynomial_and_rational/quad_formula_tutorial/e/quadratic-formula-with-complex-solutions?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraII
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https://www.khanacademy.org/math/algebra2/polynomial_and_rational/quad_formula_tutorial/v/proof-of-quadratic-formula?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraII
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