Réponses

2014-10-01T15:37:27+02:00
4(x+1)²-9=(2(x+1))²-3²=(2x+2+3)(2x+2-3)=(2x+5)(2x-1)

-2x²+8x+1=-2(x²-4x-1/2)=-2(x²-4x+4-4-1/4)=-2((x-2)²-17/4)=-2(x-2)²+17/2