<PRE><B>Question 615277</B>
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If A = C, and neither is zero, you have a circle.


If A is not equal to C, and neither is zero, but they are both the same sign, then ellipse.


If A and C have different signs, and neither is zero, then hyperbola.


If either A or C is zero, but not both, then parabola.


If both A and C are zero, then straight line.



John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
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