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A quadratic of the form -2x^2 + bx + c has roots of x = 3 + sqrt{15} and x = 3 - sqrt{15} The graph of y = -2x^2 + bx + c is a parabola. Find the vertex of this parabola.

 Apr 18, 2021
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The vertex is (6,20).

 Apr 18, 2021

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