Find the center (h, k) and radius r of the circle with the equation x2 - 16x + 64 + (y + 9)2 = 36
x^2 - 16x + 64 + (y + 9)^2 = 36
(x - 8)^2 + (y + 9)^2 = 6^2
A circle centred on (h,k) with radius = R is given by (x - h)^2 + (y - k)^2 = R^2
Hence, for our circle, (h,k) = (8, -9), and R = 6