Réponses

2014-10-11T20:08:09+02:00
Factoriser :

(x + 1) (x + 3) - x - 1    
= (x + 1) (x + 3) - (x + 1)
= (x + 1) (x + 3 - 1)
= (x + 1) (x + 2)  


bonsoir maudmarine tu as developpe l expression et non pas factoriser
2014-10-11T20:09:09+02:00
(x+1)(x+3)-x-1    
(x+1)(x+3) -(x+1)
(x+1) (x+3-1)
(x+1)(x+2)