Réponses

  • Utilisateur Brainly
2014-09-09T20:28:47+02:00
11x - (x + 1) = x - 1
11x - x - 1 = x - 1
11x - x - x = - 1 + 1
9x = 0
x = 0

(x - 1)(x + 2) = 0
x - 1 = 0 ou x + 2 = 0
x = 1 ou x = - 2

(10x - 7)(3x + 1) = 0
10x - 7 = 0 ou 3x + 1 = 0
10x = 7 ou 3x = - 1
x = 7/10 ou x = - 1/3

3x² = 12
x² = 12/3
x² = 4
x = 2