Réponses

2014-02-08T13:50:53+01:00
(2x-3)(-x+7)-(5x+3)²

-2x² +14x +3x -21 - (25x² + 30x +9)
-2x² +17x -21 - 25x² -30x -9
-27x² - 13x - 30