Which is the completely factored form of 3x^2-12x-15

Find the GCF (Greatest Common Factor)

GCF = 3

Factor out the GCF (Write the GCF first. Then, in parentheses, divide each term by the GCF)

3 (3x^2/3 + - 12x/3 - 15/3)

Simplify each term in parentheses

3 (x^2 - 4x - 5)

Factor x^2 - 4x - 5

3 (x - 5) (x + 1)