Level:
Project ID:
2010016102
Source Problem:
Accepted:
0
Clonable:
1
Easy:
0
If the equation \( x^2+y^2+z^2+2x-8y+z+18=0\) is the equation of a sphere, find its center \(S\) and radius \(r\).
It is not a sphere equation.
\( S= \left[ -1;4;-\frac12\right]\), \(r=\frac34\)
\( S= \left[ 1;-4;\frac12\right]\), \(r=\frac{\sqrt3}2\)
\( S= \left[ -1;4;-\frac12\right]\), \(r=\frac{\sqrt3}2\)
\( S= \left[ 1;-4;\frac12\right]\), \(r=\frac34\)