What is the radius of the sphere x2 + y2 + z2 – 6x + 8y – 10z + 1

1.	What is the radius of the sphere x2 + y2 + z2 – 6x + 8y – 10z + 1 = 0?
A.	5
B.	2
C.	7
D.	3
Answer» D. 3

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