Question 822607
1) (x-1)^2+(y+1)^2=5
this is a circle whose center is (1, -1) and its radius is square root of 5
2) (x-1/2)^2+(y+1/2)^2=9/2
this is a circle whose center is (1/2, -1/2) and its radius is square root of 9/2