Question

What are the center and radius of the circle described by the equation (x + 9)2 + (y + 4)2 = 36?

Answer 1

`(x-h)^2+(y-k)^2=r^2\\ (h,k) - \text{center}\\\\ (x+9)^2+(y+4)^2=36\\ \text{center}=(-9,-4)\\ r=√(36)=6`