#11-13 please (show work for the graph and equation for #12 and #13)

answer:
center: (-2, 0)
radius: 5
explanation
re write that equation in the form if the standard circle equation
(x - ( -2))^2 + (y - 0)^2 = 5^2
therefore the circle properties are: (a,b) = -2, 0 and the radius is 5