Which is an equation of a circle with center (-10, 6) and radius 8?

An equation of a circle:

(x - a) ² + (y - b) ² = r²

(a; b) - a coordinates of a center

r - a radius

r = 8; (-10; 6) ⇒ a = - 10 and b = 6

subtitute

(x - (-10)) ² + (y - 6) ² = 8²

Answer: (x + 10) ² + (y - 6) ² = 64