SOLUTION: Find the value of k for which the equation x^2+y^2+4x-2y-k=0. Please explain.

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Question 1115774: Find the value of k for which the equation x^2+y^2+4x-2y-k=0. Please explain.
Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
.
As it is written and presented, this post makes no sense.

Double check your source.