Réponses

2013-12-02T15:03:17+01:00
1) (x+5)²+(x+5)(x-1)
(x+5)(x+5)+(x-1)
(x+5)(x+5+x-1)
(x+5)(2x+4)
2) (x+5)²+(x+5)(x-1)=0
x+5=0
x=-5
ou
2x+4=0
2x=-4
x=-2