Réponses

  • Utilisateur Brainly
2013-12-01T16:35:04+01:00
b(x)= (12x+14)² - (4x+1)(6x+7)
     =4(6x+7)²-(4x+1)(6x+7)
     =(6x+7)(24x+28-4x-1)
     =(6x+7)(20x+27)
     =120x²+302x+189