Développons : (2x -3)·(x + 4) 2·x·x + 2x·4 -3x -3·4 ℹx·x = x2‖2·4 = 8‖-3·4 = -12 2x2 + 8x -3x -12 ▷Réponse : 2x2 + 5x -12