ANSWER
Center: (2,-1)
Radius: 3 units.
Step-by-step explanation
The given circle has equation:

We rearrange to get;

We add the square of half the coefficients of the linear terms to both sides of the equation as shown below:

Look out for the perfect squares on the left hand side .



By comparing to :

We have the center to be
(h,k)=(2,-1) and radius r=3.