Réponses

2014-02-24T10:48:36+01:00
A=(3x+2)²-(7x-1)²(3x+2)
=
(3x+2)(3x+2)-(7x-1)²(3x+2)
=(3x+2)[3x+2-(7x-1)²]
=(3x+2)[3x-2-(49x²-14x+1)]
=(3x+2)(3x-2-49x²+14x-1)
=(3x+2)(-49x²+17x-3)