Answer
$(x-1)^2+(y+4)^2=36$
Work Step by Step
If the center of a circle is at $(h,k)$ and its radius is $r$, then the equation of it is: $(x-h)^2+(y-k)^2=r^2$
Hence here the equation is: $(x-1)^2+(y+4)^2=36$
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