Question

What are the center and radius of the circle defined by the equation ?

Answer 1

Answer: for the equation x2 + y2 - 6x+8y +21= 0 its (3,-4) radius 2

Step-by-step explanation: hope this helps someone :3

Answer 2

You didn't give us the equation, but circle equations are in the form;
(x-h)^2 + (y-k)^2 =r^2 where h and k are the x and y coordinate of the center and r is the radius of the circle squared.