$\"\"$

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Given that equation of a circle is $\"\"$ .

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$\"\"$ (Equation of a circle)

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$\"\"$ (Add 20 to each side) $\"\"$

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$\"\"$ (20 can be written as $\"\"$ )

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$\"\"$

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$\"\"$ (Simplify)

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$\"\"$ (Add: $\"\"$ )

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$\"\"$ -------(1) (Simplify) $\"\"$

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The above equation is the form $\"\"$ -------(2)

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Compare the two equations(1) and (2),

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Hence $\"\"$ , $\"\"$ and $\"\"$ . $\"\"$

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The center = $\"\"$ and $\"\"$ .