Réponses

2013-10-07T17:35:19+02:00
(x+1)(2x-4)-(3x-1)^2=2x^2 -4x +2x -4 - 9x^2 - 1 + 6x = -7x^2 -5 +4x

voila ;)
2013-10-07T17:41:07+02:00
(x + 1) (2x - 4) - (3x - 1)²
= (2x² -4x +2x -4) - (9x² -6x +1)
= 2x² -2x -4 -9x² +6x -1
= -7x² +4x -5