Answer:
The center is at (0,-7) and the radius is 7
Step-by-step explanation:
We can write the equation of a circle as
(x-h)^2 + (y-k)^2 = r^2 where (h,k) is the center and r is the radius
x^2+(y+7)^2=49
Rewriting
(x-0)^2 + (y- -7)^2 = 7^2
The center is at (0,-7) and the radius is 7
