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

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

Correct answer is D (-1,9)

A.

(-4,2)

B.

(4,-2)

C.

(1,-9)

D.

(-1,9)

Step-by-step explanation:

since proposition states that a number is greater than 25, if is true then the number must actually be greater than 25.

this implies that all possible options, except 24, can be accepted