b) x^3 + 6x^2 + 12x + 8;
b) x3 + 6x2 + 12x + 8;
b) x3 + 6x2 + 12x + 8 = x3 + 3 . x2 . 2 + 3 . x . 22 + 23 = (x + 3)3;