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A quadratic of the form -2x^2 + bx +c has roots of x = 3 + square root of 5 and x = 3 - square root of 5. The graph of y = -2x^2 + bx +c is a parabola. Find the vertex of this parabola.

 Feb 15, 2020
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By symmetry, the vertex is (6, 12).

 Feb 16, 2020

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