what is the radius of a circle whose equation is x2 + y2 + 8x – 6y + 21 = 0??

What is the radius of a circle whose equation is x2 + y2 + 8x – 6y + 21 = 0?

The radius of a circle whose equation is x2 + y2 + 8x – 6y + 21 = 0 is 5units.

What is the radius of a circle whose equation is x2 + y2 + 8x – 6y + 21 = 0?

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