Verified answer

Réponse :

Explications étape par étape

Bonjour

(x + 3)(x - 1) + (x + 3)(2x - 8) = 0

(x + 3)(x - 1 + 2x - 8) = 0

(x + 3)(3x - 9) = 0

3(x + 3)(x - 3) = 0

x + 3 = 0 ou x - 3 = 0

x = -3 ou x = 3

x^2 - 9 + (x - 3)(-2x + 2) = 0

(x - 3)(x + 3) + (x - 3)(-2x + 2) = 0

(x - 3)(x + 3 + -2x + 2) = 0

(x - 3)(-x + 5) = 0

x - 3 = 0 ou -x + 5 = 0

x = 3 ou x = 5