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Quadratic Formula
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Main Concept
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The solutions of the equation  , where  ,  and  are constants with  , are given by the quadratic formula:
 .
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Derivation
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The quadratic formula can be derived by the method of completing the square:
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Click to place the vertex of a parabola and drag the graph to stretch the parabola. The equation, the graph, the roots, and the quadratic formula for the roots will be displayed below.
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