I'm looking for the radius of the sphere of this: $4x^2 + 4y^2 +4z^2 -16x - 24y + 8z= 44$.
I have to get it into standard form in order to find the radius. So I factored out a 4 and simplified it to:
$$x(x-4) + y(y-6) +z(z+2) =11$$
I am not sure what else I can do from here. Any ideas? Apparently the answer is 5. Which means my 11 has to get to 25 somehow. Though I don't know what I can do. Thank you in advance.