Réponses

2014-04-05T21:03:32+02:00
Bonsoir

(2x-4)(3+5x)-(3x+2)(4-2x)

6x  + 10x² -12 - 20x - ( 12x - 6x² +8 - 4x)
10x² - 14x - 12 - 12x +6x² -8 +4x
16x² -22x -20

2014-04-05T21:07:49+02:00
(2x -4) (3 + 5x) - (3x + 2) (4 - 2x)
6x + 10x² -12 - 20x - (12x - 6x² + 8 - 4x)
10x² + 6x² + 6x - 20x - 12x - 4x - 12 - 8
16x² + 6x - 36x - 20
16x² - 30x - 20