Question

Factor the following:

x2−x−20

Question 9 options:


(x−4)(x−5)



(x−5)(x+4)



(x−4)(x+5)



(x+1)(x−20)

Answer 1

(x + 4) (x - 5) so B:

Explanation:

Factor the following:

x^2 - x - 20

The factors of -20 that sum to -1 are 4 and -5. So, x^2 - x - 20 = (x + 4) (x - 5):

Answer: (x + 4) (x - 5)