Question

20 POINTS!!! Find the vertex of the quadratic function given below. f(x)=(x-4)(x+2)

Answer 1

The vertex of f ( x ) is at x = − 8/ 2 = − 4

Answer 2

Correct answer is D (-1,9)

A.

(-4,2)

B.

(4,-2)

C.

(1,-9)

D.

(-1,9)

Explanation: