Réponse :
A = (x + 4)(x + 2)
A = x² + 2x + 4x + 8
A = x² + 6x + 8
B = (x + 3)(3x + 4)
B = 3x² + 4x + 9x + 12
B = 3x² + 13x + 12
C = (x - 6)(x + 8)
C = x² + 8x - 6x - 48
C = x² + 2x - 48
D = (x - 3)(5 - x)
D = 5x - x² - 15 + 3x
D = - x² + 8x - 15
E = (2x + 4)(5x - 7)
E = 10x² - 14x + 20x - 28
E = 10x² + 6x - 28
F = (-3x + 8)(4 - x)
F = -12x + 3x² + 32 - 8x
F = 3x² - 20x + 32
