Given the binomials (x + 1), (x + 4), (x - 5), and (x - 2), which one is a factor of f (x) = 3x3 - 12x2 - 4x - 55?

(x + 1)

(x + 4)

(x - 5)

(x - 2)

We are asked in the problem which among the given factors is a factor to the function f (x) = 3x3 - 12x2 - 4x - 55. In this case, we just have to substitute the factor to x and tell which of these factors results to zero. That would be the answer. The answer to this problem then is (x-5)