Réponses

2014-01-05T15:03:32+01:00
- (x+1) ²
=-(x²+2x+1)
=-x²-2x-1

- (2x+1)²
=-(4x²+4x+1)
=-4x²-4x-1

-(x+3)²-(x+2)²
=-(x²+6x+9)-(x²+4x+4)
=-x²-6x-9-x²-4x-4
=-2x²-10x-13