How do you find this in a circle?

Question

I'm supposed to find the center and the radius of a circle. Using the equation x^2 + y^2=16 (x squared plus y squared=16).

I know the radius is 4, how do i find the center, meaning (x,y)

Please help me, thanks!

Answer 1

the center is (0,0) the center is different whenever there is a number in front of the x or y