Bonjour besoin daide pour l'exercice 45 Merci

1.a. A = (2x-1)(x+2)+(-1)(2x-1)

b. A = (2x-1)[(x+2)+(-1)]
A = (2x-1)(x+2-1)
A = (2x-1)(x+1)

2. a) B = (x-2)(x+1)-x+2
B = (x-2)[(x+1)-1]
B = (x-2)x

b) C = (x-3)² - x+3
C = (x-3)[(x-3)-1]
C = (x-3)(x-4)