Y= a(x-2)(x+4) 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) -9ab) -8a c) -5ad)-2acan you tell me how to solve it.

A

Step-by-step explanation:

First set y=0, then solve resulting in y=2,-4, plug those values into the midpoint formula. then you get x=-1, then plug -1 in for x in the equation. so it becomes y=a(-1-2)(-1+4). Solve that and you get y=a(-3)(3), multiply that together and you get -9a

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step-by-step explanation: ; )