equation of a circle is given as
(x-a)^2 + (y-b)^2 = r^2
where (a,b) is coordinates of center of the circle and r is radius.
as per shown in graph we can see center of circle.is ( -7, -2)
now let's calculate radius. we have to calculate distance between any point on circle and center . let's take point (-7,0) on the circle shown in graph.
r = √((-7-(-7))^2 + (0-(-2))^2
r = √4 = 2
so equation is
(x -(-7))^2 + (y - (-2))^2 = 2^2
(x +7)^2 + (y +2)^2 = 4
