Réponses

2014-01-12T20:26:41+01:00
B = 3(x + 2 )+5x(-x+6) 
=3x+6-5x²+30x
=-5x²+33+6

c = -2x(4x+5) -5x (10-x) 
=-8x²-10-50x+5x²
=-3x²-50x-10