Réponses

2013-11-16T10:47:50+01:00
-3(x+2)+(-x+2)(x-1)
-3x-6+(-x²+x+2x-2)
-3x-6-x²+x+2x-2
-x²-8

4x-(x-2)(x+3)
4x-(x²+3x-2x-6)
4x-x²-3x+2x+6
-x²-3x+6
2013-11-16T11:26:45+01:00
= -3 ( x + 2 ) + ( -x + 2 ) ( x - 1 )
= -3 * x - 3 * 2 - x * x - x * (-1) + 2 * x + 2 * (-1)
= -3x - 6 - x^2 + 1x + 2x - 2
= -x^2 - 8

= 4x - ( x - 2 ) ( x + 3 )
= 4x - x * x + x * 3 - 2 * x - 2 * 3
= 4x - x^2 + 3x - 2x - 6
= -x^2 + 5x - 6