Step-by-step explanation:

or equivalently

We often write variable side-byside without the multiplication sign in algebra. It also applies to terms with indices. For instance,

We may, often also add a dot at the middle of both terms as another version of multiplication sign for better readability if the terms are more complicated, for instance

and

Answer:
3(x - 4)
Step-by-step explanation:
Given
3x - 12 ← factor out 3 from each term
= 3(x - 4)
ANSWER
C. f(x) = (x+3)(x+5)
EXPLANATION
The given function is

The factored form of the function reveals the zeros of the function.
From the factored form, we apply the zero product principle to get the zeros.
From the given options, the factored form of the polynomial is

-2x + x/4 + 1 = 5
-2x + x/4 = 4
-7x/4 = 4 (By using the same denominator)
x = -16/7