Réponse :
1. g(x) = (x+2)² - 1 = x² + 4x + 3
2. g(x) = (x+2-1)(x+2+1) = (x+1)(x+3)
3. a) g(x) = (x+2)² - 1 => g(-2) = -1
b) g(x) = x² + 4x + 3 = 3 => x² + 4x = 0 => x(x+4) = 0 => x = 0 ou x = -4
c) (x+1)(x+3 = 0 => x = -1 ou x = -3
Bonne journée
Explications étape par étape
