Write an equation of the circle with center , 9−7 and radius 12 .

The equation of a circle is:

(x - h)² + (y - k)² = radius²
where (h, k) is the center. 

Assuming your center is (9, 7) your equation is:
(x - 9)² + (y - 7)² = 144

Assuming your center is (9, - 7) your equation is:
(x - 9)² + (y + 7)² = 144

Idon’t actually know but have you asked google yet