Réponse :
factoriser
c) C = 36 - (3 + 2 x)² = 6² - (3 + 2 x)²
C = (6 - (3 + 2 x))(6 + (3 + 2 x))
C = (6 - 3 - 2 x)(6 + 3 + 2 x)
C = (3 - 2 x)(9 + 2 x)
d) D = (x + 3)² - 25 = (x + 3)² - 5²
D = (x + 3 - 5)(x + 3 + 5)
D = (x - 2)(x + 8)
Explications étape par étape :
