SAT Math Practice Question
$$y=a(x-2)(x+4)$$In the quadratic equation above, $a$ is a nonzero constant. The graph of the equation in the $x y$-plane is a parabola with vertex $(c, d)$. Which of the following is equal to $d$ ?
- A.$-9 a$
- B.$-8 a$
- C.$-5 a$
- D.$-2 a$
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