Réponse:
A =7(2x - 8)
A = 14x - 56
B = -2(3x - 4)
B = - 6x + 8
C = (5x - 2) (7x - 8)
C = 35x² - 40x - 14x + 16
C = 35x²-54x+16
D = (3x+4)²
D = 9x²+ 24x + 16
E = (4x - 2) ( x - 5) + (2x - 3) (x - 8)
E = 4x² -20x - 2x + 10 + 2x² - 16 - 3x + 24
E = 4x² + 2x² - 22x - 3x +10 + 24
E = 6x² - 25x + 34
