Réponses

2013-12-02T17:49:27+01:00
1) (2x-1)²-16
   (1-1)²-16=0²-16=-16
2) (2x-1)²-16
   4x²-4x+1-16
   4x²-4x-15
3) (2x-1)²-16
 [ (2x-1)-4][(2x-1+4]