Réponse :
a) recopier et compléter
B = (2 x - 3)(5 x + 7) - 1 (2 x - 3)
b) factoriser alors B
B = (2 x - 3)(5 x + 7) - 1 (2 x - 3)
= (2 x - 3)(5 x + 7 - 1)
= (2 x - 3)(5 x + 6)
2) factoriser
C = (x - 3)² - x + 3
= (x - 3)² - (x - 3)
= (x - 3)(x - 3 - 1)
= (x - 3)(x - 4)
D = (x - 4)(3 x + 2) - 3 x - 2
= (x - 4)(3 x + 2) - (3 x + 2)
= (3 x + 2)(x - 4 - 1)
= (3 x + 2)(x - 5)
Explications étape par étape
