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given the equation of a circle x^2+y^2-10x+4y+13=0. find its center and radius. i am having trouble please help

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[tex] x^2+y^2-10x+4y+13=0\\
x^2-10x+25+y^2+4y+4-16=0\\
(x-5)^2+(y+2)^2=16\\\\
\hbox{center}=(5,-2)\\
r=4[/tex]

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