Factor the trinomial: x2−x−20x^2 - x - 20x2−x−20.
(x−5)(x+4)(x - 5)(x + 4)(x−5)(x+4)
(x+5)(x−4)(x + 5)(x - 4)(x+5)(x−4)
(x−10)(x+2)(x - 10)(x + 2)(x−10)(x+2)
(x−20)(x+1)(x - 20)(x + 1)(x−20)(x+1)