Réponses

2014-01-30T18:28:03+01:00
A(x)=(2x-3)²-4(x+2)(9-6x)
Or 9-6x=-3(2x-3) donc
A(x)=(2x-3)²+12(x+2)(2x-3)
       =(2x-3)((2x-3)+12x+24)
       =(2x-3)(14x+21)