Réponses

2012-12-05T15:42:23+01:00

(x+5) [(x+5) + (x-1)]

(x+5) [x+5 + x-1]

(x+5) [4x]

(x+5)(4x)

Meilleure réponse !
2012-12-05T17:10:01+01:00

(x+5)²+(x+5)(x+1)=(x+5)(x+5)+(x+5)(x+1)

                                 =(x+5)[(x+5)+(x+1)]

                                 =(x+5)(x+5+x-1)

                                 =(x+5)(2x+4)