Réponses

2014-02-19T20:28:35+01:00
Développement
D = (2x+5)(3x-1)
D = 6x² -2x +15x -5
D = 6x² +13x -5

D = x = -1/2
6x² +13x -5
6 X -1/2² + 13 X -1/2² -5
6 X +1/4 +13 X 1/4 -5
6/4 +13/4 -20/4
-1/4

E = (x-1)² +x² + (x+1)²
x² +2x +1 +x² +x² +2x +1
3x² +4x +2