Question

What are the center and the radius of a circle with the equation (x + 5)² + (y - 4)² = 81

Answer 1

Explanation:

We know that if the equation of the circle is (x-h)^2 + (y-k)^2 = r^2, it has a center of (h,k) and a radius of r.

Matching this up with the given equation, we get the center is (-5, 4) and the radius is 9.