Find the center and radius of the circle x^2 + y^2 –6y – 16 = 0
(x-0)^2 + y^2 - 6y = 16 complete the square on x and y
(x-0)^2 + (y-3)^2 = 16+9 does that help?
Do you remember the standard form of a circle equation?
+36916 
