Réponses

2014-02-25T13:59:28+01:00
(3x-1)² - (5x-2)*(x-3)
= 9x
² - 6x + 1 - [5x*x + 5x*(-3) - 2*x -2*(-3)]
= 9x
² - 6x  + 1 - (5x² - 15x - 2x + 6)
= 9x² - 6x + 1 - 5x² + 15x + 2x - 6
= 4x² + 11x - 5