Question

Factor the common factor out of
-12+15X

Answer 1

The answer is 3(5x-4)

Answer 2

The factors of -12 are: +-(1, 2, 3, 4, 6, and 12).
The factors of 15x are: +(1, 3, 5, 15, and x).
Since the only factors that the two numbers share are 3 and 1, those are your common factors with 3 as your GCF.