Factor: 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)