Réponses

2013-11-29T14:43:29+01:00
(x - 3)² - (x - 1) (x-2).
= x² - 6x + 9 - x² + 3x - 2
= -3x + 7


2013-11-29T15:07:36+01:00
(x-3)²-(x-1)(x-2)
x²-6x+9-(x²-2x-x+2)
x²-6x+9-x²+2x+x-2
-3x+7