AIR MATH

Math Question

What are the center and radius of the circle defined by the equation \( x^{2}+y^{2}-6 x+8 y+21=0 \) ? A. Center \( (-3,4) \); radius 2 B. Center \( (3,-4) \); radius 4 C. Center \( (3,-4) \); radius 2 D. Center \( (-3,4) \); radius 4

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