Question

The center of a circle is at (7, –3) and it has a radius of 9. What is the equation of the circle?

(x – 7)2 + (y + 3)2 = 3


(x + 7)2 + (y – 3)2 = 3


(x + 7)2 + (y – 3)2 = 81


(x – 7)2 + (y + 3)2 = 81

Answer 1

Given:
center (7,-3)
radius = 9

Equation of the circle:
(x-h)² + (y-k)² = r²
(x-7)² + (y-(-3)² = 9²
(x-7)² + (y+3)² = 81 Last option.