Réponses

2014-06-23T13:41:34+02:00
15x - 7x² - 6 + 5x² -2x

= -7x² + 5x² + 15x - 2x -6

-2x² + 13x - 6
2014-06-23T13:46:18+02:00
15x-7x²-6+5x²-2x
= -7x
²+5x²+15x-2x-6
= -2x²+13x-6