Réponses

2013-11-15T23:22:43+01:00
A= 4(3x² + x) -5 (2x² + x +2)
=12x²+4x-10x²-5x+10
=7x²-x+10

B= (x+2) (2x-5)
=2x²-5x+4x-10
=2x²-x-10

C= (4x-3)² - 14x² + 23x - 19
=16x²-24x+9-14x²+23x-19
=2x²-x-10