Answer
center $(2,-1)$, radius $r=3$
Work Step by Step
Rewrite the equation and form squares of $x,y$, we have $x^2-4x+4+y^2+2y+1=4+4+1\longrightarrow (x-2)^2+(y+1)^2=9$. Thus, the equation represents a circle with center at $(2,-1)$ and radius $r=3$
