Réponses

2013-05-29T21:11:30+02:00

A = 6x² - 14x

 

B = 10x² - 15x + 2x - 3

    = 10x² - 13x - 3

 

C = (7x - 3) [(7x - 3) - (2x - 5)]

    = (7x - 3) (5x + 2)

    = 35x² + 14x - 15x - 6

    = 35x² - x - 6

Meilleure réponse !
2013-05-29T21:12:03+02:00

Bonsoir

 

A = 6x²-14x

B = 10x²-15x+2x-3 = 10x²-13x-3

C = 49x²-42x+9 - (14x²-35x-6x+15)

= 49x² -42x +9 -14x² +35x +6x -15

= 35x² -x -6