Réponses

  • Utilisateur Brainly
2014-04-16T16:58:46+02:00
9x²-x = 0
x(9x-1) = 0

9x-1 =0
9x =1
x =1/9

x = 0

9x²-4 = 0  =a²-b² = (3x-2)(3x+2) = 0
3x-2 =0
3x =2
x =2/3

3x+2 = 0
3x =-2
x =-2/3