Réponses

2012-05-30T16:59:51+02:00

A=3x(6x²-5x+2)+7x(1-4x)-8x³+ 9x² + 11

=18x³-15x²+6x+7x-28x²-8x³+9x²+11

=10x³-34x²+13x+11

 

Pour x=2

On a : 10*2³-34*2²+13*2+11

=10*8-34*4+26+11

=80-136+26+11  = - 19