Hi,
Can anyone give me a hand with the following problem please?
For what range of values of k does: x^2+y^2+4kx-2ky-k-2+0
represent a circle?
I have tried using the radius formula :-
Sqrrt (-2k)^2 + (k)^2 -(k-1)
Sqrrt 4k^2 + k^2 -k+1
Sqrrt 5k^2 -k+1......
Thanks
Cromlix