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y = a (x - 2)(x + 4)
"In the quadratic equation above, a is a nonzero constant. The graph of the equation in the xy-plane is a parabola with vertex (c, d). Which of the following is equal to d ?"
A) -9a
B) -8a
C) -5a
D) -2a
The answer is Choice A, -9a. Attached is a visual that should help.
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