Which is the completly factored form of 3x2-12x-15?

(3x-15) (x+1)

Step-by-step explanation:

Given an expression in the form ax²+bx+c, where a, b and c are constants, we can factor it by first finding the two numbers that when multiplied equal to ac and when added equal to b

The expression 3x²-12x-15 can be factored as follows:

The two numbers that can be added to give 3 * (-15) and when added result to - 12 are - 15 and 3.

Thus, 3x²+3x-15x-15

3x (x+1) - 15 (x+1)

The simplified form becomes: (3x-15) (x+1)