Bonjour es ce que mes caluculs sont justes il fallait factoriser :
A = (1-4x)² + (5x +7) (1-4x)
A = (1-4x)(1-4x) +(5x+7)
A = (1-4x)(1-4x +5x+7)
A = (1-4x)(x +8)
B = 3x(8-2x) - (8-2x)²
B = 3x (8-2x)
C= (6x+3)² - (6x-3)(6x+3)
C = (6x+3)(6x+3) - (6x-3)(6x+3)
C = (6x+3)(6x-3 -6x +3)
C = (6x+3)
