Practice problem
Factor x2−x+21x−21x^2-x + 21x-21x2−x+21x−21.
(x+1)(x−21)(x+1)(x-21)(x+1)(x−21)
(x−1)(x+21)(x-1)(x+21)(x−1)(x+21)
(x+3)(x−7)(x+3)(x-7)(x+3)(x−7)
(x−3)(x+7)(x-3)(x+7)(x−3)(x+7)
Type a concept, like “slope” or “photosynthesis”.
