Réponses

2014-05-12T20:40:39+02:00
 4-(x-1)²
2² -(x-1)²
(2 -x+1)(2+x -1)
(-x +3)(x+1)
ca c est factoriser

developper
4 -(x-1)²
4 -(x² 2x +1)
4 -x² +2x -1
-x² +2x +3