Find the center and the radius of the sphere that has the given equation. Select the correct answer.
$$x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 4 x + 8 y = 0$$
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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The Answer of Find the center and the radius of the sphere that has the given equation. Select the correct answer.
$$x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 4 x + 8 y = 0$$
A) $( 2 , - 4,0 ) , 2 \sqrt { 5 }$
B) $ ( - 2,4,0 ) , 20$
C) $( - 2,4,0 ) , 2 \sqrt { 5 }$
D) $( 2 , - 4,0 ) , 20$

Find the Center and the Radius of the Sphere That x2+y2+z2−4x+8y=0x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 4 x + 8 y = 0x2+y2+z2−4x+8y=0

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