Réponses

2013-11-12T19:57:31+01:00
4(2x+1)² -8x-4
=
4(2x+1)² -4(2x+1)
=4(2x+1)(2x+1)-4(2x+1)
=(2x+1)(8x+4-4)
=8x(2x+1)