<PRE><B>Question 464984</B>
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Your given directrix is a vertical line (*[tex \Large x\ =\ a]), that means you should use the form that has the *[tex \Large y] variable squared.  If the directrix is horizontal (*[tex \Large y\ =\ b]), then use the form with the *[tex \Large x] variable squared.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
My calculator said it, I believe it, that settles it
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