Réponses

2013-12-28T14:20:30+01:00
F(x)=(2x-1)(x+3)-(2x-1) ² = 2x² + 6x - x - 3 - 4x² + 4x - 1 = -2x² + 9x - 4 
f(x) = (2x-1)(x+3-2x+1) = (2x-1)(-x+4)