Question

Which is a factor of 5x2-15x-20
A.) x-8
B.) x+4
C.) x-5
D.) x+1

Answer 1

x+1

Explanation:

5x^2 − 15x − 20

5(x^2 - 3x - 4)

5(x-4) (x+1)

therefore, the answer is (x+1)

Answer 2

Assuming you mean 5X^2-15X-20, factoring will get you two answers
(5X-20) and (X+1)
When multiplied together they give you the original equation