Rewriting a quadratic function from vertex form to standard form | Khan Academy

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https://www.khanacademy.org/math/algebra-1-tx/x36b5a29ce1c3a684:investigation-and-application-of-exponential-functions/x36b5a29ce1c3a684:writing-quadratics-from-vertex/v/rewriting-a-quadratic-function-from-vertex-form-to-standard-form

Given a quadratic function in vertex form, rewrite it in standard form.

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