Réponses

2014-09-16T23:54:29+02:00
16(x-1)(x-1)-8(x-1)(x+5)
=8(x-1)[8(x-1)-(x+5)]
=8(x-1)(8x-8-x-5)
=8(x-1)(7x-13)
=8(7x*-13x-7x-13)
........

*=a la puissance 2