Réponses

  • Utilisateur Brainly
2013-10-06T14:36:27+02:00
A(x)=4(x+1)²-(x-2)(2x+2)
      =4(x+1)²-2(x-2)(x+1)
      =(x+1)(4x+4-2x+4)
      =(x+1)(2x+8)

B(x)=(2x-7)(3x+6)-2(2x+4)(2x-8)
      =3(2x-7)(x+2)-8(x+2)(x-4)
      =(x+2)(6x-21-8x+32)
      =(x+2)(-2x+11)

C(x)=9x²+6x+1-(5x+7)(6x+2)
      =(3x+1)²-2(5x+7)(3x+1)
      =(3x+1)(3x+1-10x-14)
      =(3x+1)(-7x-13)

D(x)=x(6x+5)+4x(x-4)
      =6x²+5x+4x²-8x
      =10x²-3x
      =x(10x-3)