Réponses

2013-10-24T15:02:21+02:00
A    x=4(x-1)(x-1)-9
      4(x²-x-x+1)-9 =4(x²-2x+1)-9  =(4x²-8x+4)-9  =4x²-8x-5
  
B    x= 4x²+2x-10x-5  =4x²-8x-5