Réponses

2014-04-16T17:49:08+02:00
A= (-6x-4)² -36
  = [(-6x-4)-6] [(-6x-4+6)]
  = (-6x-4-6) (-6x-4+6)
  = (-6x-10) (-6x+2)
  = 2(-3x-5) (-3x+1)
B= -(x+6) (10x+5)+100x²-25
  = -(x-6)(10x+5) +(10x-5)(10x+5)
  = (10x+5) [-(x+6)+(10x-5)
  = (10x+5) (-x-6+10x-5)
  = (10x+5) (9x-11)
C= (10x+7) (2x+2)-(10x+7)(-2x+9)
  = (10x+7) [(2x+2) -(-2x+9)
  =(10x+7) (2x+2+2x-9)
  =(10x+7) (4x-7)
les autres sont les memes .. meme stucture ..
merci
de rien :')