Respostas

2014-02-02T14:03:27-02:00
(x-5)²=2x(x-5)
x²-10x+25= 2x²-10x
x²-2x² -10x+10x+25=0
-x²+25=0  x(-1)
x²-25=0
x²=25
x1= √25
x=5
x2= -√25
x2=-5

S={-5,5}