Réponses

2012-12-15T18:17:18+01:00

D=5 (x-3)-x²-6x+9

=5x-15-x²-6x+9

=-x²-²-6

 

E=4x²-1-(14x²+6x-7x+2)

=4x²-1-14x²-6x+7x+2

=-10x²+x+1