Question: A certain circle can be represented by the following equation.x + y + 4x - 18y + 81 = 0What is the center of this

A certain circle can be represented by the following equation.x² +

y² + 4x - 18y + 81 = 0What is the center

A certain circle can be represented by the following equation.x² + y² + 4x - 18y + 81 = 0What is the center of this circle ?What is the radius of this circle ?

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