Answer
(a)
Work Step by Step
Judging from the intercepts, the center is $(h,k)=(3,-3)$
and the radius is 3
The standard form of an equation of a circle with radius $r$ and center $(h,k)$ is
$(x-h)^{2}+(y-k)^{2}=r^{2}$
This circle has standard equation:
$(x-3)^{2}+(y+3)^{2}=9$
(a)
