Réponses

2014-02-09T19:28:23+01:00
(2²+2*2*x+x²) + (4+2x) (5x+1) + (2²+2*2*x+x²)
=(4+4x+x²) + (20x+4+10x²+2x) + (4+4x+x²)
= 4+4x+x²+20x+4+10x²+2x+4+4x+x²
=10x²+30x+12