A circle is centered at (-6) and has a radius of 8. What is the equation of the circle? (x - 4) ^ 2 + (y + 6) ^ 2 = 64; (x + 4) ^ 2 + (y - 6) ^ 2 = 64; (x + 4) ^ 2 + (y - 6) ^ 2 = 16; (x - 4) ^ 2 + (y + 6) ^ 2 = 16