Réponses

2012-11-18T09:31:30+01:00

E = (x-3)² -(x-1) (x-2)

E = x² + 6x - 9 - (x² -2x -x + 2)

E = x² + 6x -9 -x² + 2x + x -2

E = 9x -11

 

b) =0