Question

What is the equation of a circle with radius 9 and center (-2,3)?

Answer 1

The equation of a circle with its center at point `(a, b)` with radius `c` is given by `(x-a)^2 + (y-b)^2 = c^2`. In this case, therefore, the equation of the circle is `(x+2)^2+(y-3)^2 = 9^2`.

Explanation:

The explanation above is enough detail, I think, as long as the signs `(+ or -)` of the points are carefully noted.