Réponses

2013-05-06T22:30:56+02:00

9x² - 2 x 9x x(-3) + (-3)² - (2x+5)

9x² - (-54) + 9 - (2x+5)

9x² + 63 - (-2x) - 5

9x² + 2x + 48

2013-05-06T22:35:45+02:00