Réponses

  • Utilisateur Brainly
2014-04-05T14:39:09+02:00
A=(3x +4)(5x - 2) - (20x - 12)
  =15x²-6x+20x-8-20x+12
  =15x²-6x+4

B = 4 - 3x(2-5x)
   =4-6x+15x²
   =15x²-6x+4

donc A=B