soluzione Eseguire le operazioni indicate x - 1 x2 - x - 2   +   2 x2 - 4   +   2 x3 + x2 - 4x - 4   = x - 1 (x - 2)(x + 1)   +   2 (x - 2)(x + 2)   +   2 (x + 1)(x - 2)(x + 2)   = (x - 1)(x + 2) + 2(x + 1) + 2 = = (x - 2)(x + 1)(x + 2) x2 - x + 2x - 2 + 2x + 2 + 2 = = (x - 2)(x + 1)(x + 2) x2 + 3x + 2 = = (x - 2)(x + 1)(x + 2) (x + 1)(x + 2) = = (x - 2)(x + 1)(x + 2) 1 =     (x - 2)