How do you find the center and radius of the circle #(x - 3) ^2 + (y + 1) ^2 = 9#?
The centre-radius form of a circle is
Given this, we would know that the center of the circle is
Luckily we are given the centre-radius form so we can easily get/compute for what was asked. However, if we are given the standard form of a circle, we should first do completing the square to transform it into its center-radius form.