Exercice Factoriser D(x) = 4x² - 12x+9; E(x) = 8x³ +12x² + 6x + 1; F(x) = x³-8; G(x) = x³-1 25 ; H(x) = 9x¹ - 12x + 4;1 = 8x³-12x² + 6x-1; J(x) = x² - 4 + 2x(5x+4); K(x) = x -1; L = (x²-4)(x+2)²; M =x³-2x²-5x+6; M = x + x³-4x-16. N = x + 2x²+1.​