on considere A=3x(6xau carre-5x+2)+7x(1-4x)-8xau cube+9xcarre+11 developper et reduire calculer Apour x=2
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