The centre and radius of the circle \(x^2+y^2-6x+8y=0\) are
A. \((-3,4)\) and 5
B. \((3,-4)\) and 5
C. \((-3,4)\) and 25
D. \((3,-4)\) and 25
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Answer: B. \((3,-4)\) and 5
Centre \((-g,-f)=(3,-4)\), \(r=\sqrt{9+16}=5\).
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· 23 Oct 2026
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