Réponses

2013-04-06T17:52:40+02:00

A = (3x - 5)(6x + 7) - (3x - 2)(6x + 7) 

A = 18x² + 21x - 30x - 35 - (18x² + 21x - 12x - 14)

A = 18x² - 9x- 35 - 18x² - 21x + 12x + 14

A = -18x - 21

2013-04-06T17:54:04+02:00

A = (3x - 5)(6x + 7) - (3x - 2)(6x + 7) =18x² + 21x - 30x - 35 - (18x² + 21x - 12x - 14)=18x² - 9x- 35 - 18x² - 21x + 12x + 14= -18x - 21