Look at the function below.
f(x) = -x? – 2x + 8
Which function is an equivalent form that can be used to identify the maximum value of the function?
f(x) = -(x + 1)2 + 7
f(x) = -(x + 1)2 + 9
f(x) = -(x + 2)(x - 4)
f(x) = -(x - 2)(x + 4)