Write the equation of the circle which satisfies the given conditions.
a) Center (2, -6), radius 5 b) Center (0, 4) radius 4
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a) Center (2, -6), radius 5
\(f(x)=\pm \sqrt{5^2-(x-2)^2}-6\)
b) Center (0, 4) radius 4
\(f(x)=\pm \sqrt{4^2-x^2}+4\)
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