Find radius and center of sphere.
3x^2 + 3y^2 + 3z^2 + 6x - 6y = 3
Hello,
Do you know what the equation of a sphere is ?
$\displaystyle (x-x_0)^2+(y-y_0)^2+(z-z_0)^2=r^2$
Center $\displaystyle (x_0,y_0,z_0)$ and radius r.
Divide by 3 :
$\displaystyle x^2+y^2+z^2+2x-2y=1$
$\displaystyle (x^2+2x)+(y^2-2y)+z^2=1$
Complete the squares for the stuff in the brackets.