Réponses

2013-09-28T11:38:15+02:00
2(x-1)²-8=0
2((x-1)²-4)=0
2(x-1-2)(x-1+2)=0
2(x-3)(x+1)=0
x=3 ou x=-1


2013-09-28T11:46:43+02:00
2(x-1)²-8=0
2(x²-2x+1)-8=0
2x²-4x+2-8=0
2x²-4x-6=0