What’s the radius of a circle (x+2)^2 + (y-5)^2=9

Explanation:

The equation

(x+2)^2 + (y-5)^2=9

is the same as

(x-(-2))^2 + (y-5)^2=3^2

Compare this to

(x-h)^2 + (y-k)^2 = r^2

We see the center is (h,k) = (-2,5) and the radius is r = 3.