What is the center and the radius of the circle x2 plus y2 -4x -6y -3 equals 0?

Equation of circle: x^2 +y^2 -4x -6y -3 = 0

Completing the squares: (x-2)^2 +(y-3)^2 = 16 square units

Therefore center of circle is at (2, 3) and its radius is 4 units