Réponses

2013-06-04T20:57:41+02:00

Bonsoir

 

A = 3

B = 2

C = 2

D = 2

E = 3

F = 1

 

G = (5x-3)² + ( 5x-3)(3x+2)

G = 25x² -30x+9 +(15x²+10x -9x -6)

G = 25x² -30x +9 +15x² +10x -9x -6

G = 40x² -29x +3

 

G = (5x-3)(5x-3)+(3x+2)

G = (5x-3)(5x-3+3x+2)

G = (5x-3)(8x +1)

 

(5x-3)(8x+1) = 0

soit 5x-3 = 0 donc 5x = 3 et x = 3/5

ou 8x+1 = 0 donc 8x = -1 et x = -1/8

 

pour x = -1, G  = (-5-3)(-8+1) = -8 x -7 = 56