Réponses

Meilleure réponse !
2013-05-15T18:20:19+02:00

 a=(x-3) (x+2)

=x²+2x-3x-6

=x²-x-6

 

b= (y+2) (y-3)

=y²-3y+2y-6

=y²-y-6

 

 c=(4x+1) (5-x)

=20x-4x²+5-x

=-4x²+19x+5

 

d= (5y-2) (y+3)

=5y²+15y-2y-6

=5y²+13y-6

2013-05-15T18:21:03+02:00

a = x² + 2x - 3x -6

a = x² -x -6

 

b = y² - 3y + 2y -6

b = y² -y -6

 

c = 20x -4x² +5 - x

c = 4x² -19x +5

 

d = 5y² +15y -2y -6

d = 5y² +13 y -6

 

voilà voilà ;)