Réponses

2013-01-30T14:37:31+01:00

(9x+1)²+9x+1

=(9x+1)*(9x+1)+(9x+1)*1

On factorise par (9x+1)

Donc (9x+1)²+9x+1=(9x+1)*(9x+1+1) = (9x+1)(9x+2)