Thread: Circle Problem

Find a necessary and sufficient condition on A, B, C, D, and E for Ax^2 + By^2 + Cx + Dy + E = 0 to be an equation of a circle.

You have some over one hundred postings.
So, you should understand that this is not a homework service nor is it a tutorial service.
PLease either post some of your own work on this problem or explain what you do not understand about the question.