Réponses

2012-11-14T22:00:26+01:00

 

Factoriser:

(x-1)(x+3)-(2-x)(x-1)=0

(x-1)(x+3-x+1)=0

4(x-1)=0

4x-4=0
x=1

2012-11-14T22:46:33+01:00

(x-1)(x+3)=(2-x)(x-1)    (x-1)(x+3)-(2-x)(x-1)=0    (x-1)(x+3-2+x)=(x-1)(2x+1)

bonne chance