M = (5-3)(+4)-4(+4) Développement M = (5x² +20x -3x +12) - (4x² +16x) M = 5x² +17x +12 -4x² -16x M = x² +x +12 Factorisation M = (x+4)(5x-3)-4x M = (x+4)(5x-3-4x) M = (x+4)(x -3)
N = 4(-1)-(-1)² N = 4x -4 - (x² -2x +1) N = 4x -4 - x² +2x -1 N = -x² +6x -5 Factorisation N = 4 (x-1)