ANSWER
A. f(x) = 2(x + 4)(x - 1)
Step-by-step explanation
We have the function f(x) given as:

The general form of a quadratic function is:

To factor a quadratic equation, we have to find two numbers such that their sum is b and their product is ac i.e. a * c
From the given function, the two numbers we need are 8 and -2.
So, we have:

That is the answer.