Réponses

2014-01-27T17:00:36+01:00
(2x-3)^2 -(2x-3)(x+1) = ((2x - 3)(2x-3 - x - 1) = (2x - 3 )(x - 4) = 2x² - 8x - 3x + 12 
= 2x² - 11x + 12