Réponses

2013-11-27T18:20:37+01:00
(6x + 1) ² - (7 + 4x) ²
=(6x+1-7-4x)(6x+1+7+4x)
=(2x-6)(10x+8)
=2(x+3)2(5x+4)
=4(x+3)(5x+4)