Réponses

2014-02-06T20:36:14+01:00
A/   E = (3x -1)² +9x² -1 = 9x²-6x+1 +9x² -1 = 18x² -6x = 6x (3x -1)

b/ 9x²-1 = (3x+1)(3x-1)

c = 6*-1/6 ( 3*-1/6-1)
c = -6/6 ( -3/6 -1) = -1 ( -3/6+6/6) = -1 (3/6) = -3/6

pour le 4 je ne vois pas l exercice