x²+4y²+2x-4y+2=0
(x²+2x+1)+(4y²-4y+1)=0
(x+1)²+(2y-1)²=0
x+1=0,2y-1=0
x=-1,y=1/2
√﹙x²+5y²)
=√﹙1+5/4)
=3/2