Răspunsuri

2014-04-22T14:33:16+03:00
(x-1)²=4
(x-1)²-4=0
[(x-1)-2][(x-1)+2]=0
(x-3)(x+1)=0
x-3=0    x+1=0
x=3           x=-1
bravo Miky, acum am inteles cum rezolvati la gimnaziu ec.de gr.2