Réponses

2014-10-15T23:14:50+02:00
(X+2)(x-1)=0 

X+2 = 0  ou   X-1 = 0

X=-2  ou  X = 1      donc  S = {-2,1}

(2x+3)(x+5)=0 

2X+3 = 0  ou   X+5 = 0

X=-3/2  ou  X = -5      donc  S = {-5,-3/2}