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what is the center and radius of the equation x^2+y^2-6x+8y+21=0

Guide :High School

what is the center and radius of the equation x^2+y^2-6x+8y+21=0

What is the center and radius of the equation x^2+y^2-6x+8y+21=0 A. Center (3, -4); radius 4 B. Center (-3, 4); radius 4 C. Center (-3, 4) radius 2 D. Center (3, -4) radius 2
Work shown above! Answer is D! ...

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