Find the Center and the Radius of the Sphere That $$x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 4 x + 8 y = 0$$

question 28

Multiple Choice

Find the center and the radius of the sphere that has the given equation.
$$x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 4 x + 8 y = 0$$

• A) \(( 2 , - 4,0 ) , 2 \sqrt { 5 }\)
• B) \(( - 2,4,0 ) , 20\)
• C) \(( - 2,4,0 ) , 2 \sqrt { 5 }\)
• D) \(( 2 , - 4,0 ) , 20\)

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