Completely factor the polynomial x2+41x+420x^2 + 41x + 420x2+41x+420.
(x+420)(x+1)(x + 420)(x + 1)(x+420)(x+1)
(x+20)(x−21)(x + 20)(x - 21)(x+20)(x−21)
(x−20)(x−21)(x - 20)(x - 21)(x−20)(x−21)
(x+20)(x+21)(x + 20)(x + 21)(x+20)(x+21)