The center is (5,3). $a=\sqrt{25}=5$, $b=\sqrt{9}=3$.

⇒ $c=\sqrt{a^2-b^2}=\sqrt{25-9}=4$

Therefore, the foci are 4 units away from the center horizontally: (5+4,3)=(9,3) and (5-4,3)=(1,3).