Réponses

2013-12-18T20:54:27+01:00
(4x-3)² -(x+2)²
=16x²-24x+9-(x²+4x+4)
=16x²-24x+9-x²-4x-4
=15x²-28x+5

2x(x+3)(x+3)(x+1)