Réponses

  • Utilisateur Brainly
2014-05-12T18:10:14+02:00
Facto :
(3x+2)(3x+2-x-7) =
(3x+2)(5x-2)

dev :
15x²-6x+10x-4 =
15x²+4x-4

calculer x = 1/2

15(1/2)² + (4*1/2) -4 =
15/4 + 4/2 -4 =
(15+8-16)/4 =
7/4