Réponses

2013-10-24T15:31:24+02:00
A = 4x*2x - 4x*5 = 8x² - 20x

B= 4x*1 - 4x*2x - 1*1 + 1*2x = 4x - 8x² - 1 + 2x = -8x² + 6x -1