Mathematics, 26.01.2020 02:31 stranger123

What is the location of the vertex of the parabola defined by f(x) = −x2 + 8x − 21 and in what direction does the parabola open?

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What is the location of the vertex of the parabola defined by f(x) = −x2 + 8x − 21 and in what direc...

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