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    Find the Radius and Center of a Circle by Completing the Square

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    Complete the square to determine the radius and center of the circle.
    x^2+y^2+2x-8y+12=0 and sketch its graph.

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    The radius and center of a circle are found using completing the square. The solution is detailed and well presented. The response received a rating of "5" from the student who originally posted the question.