There is an error because the directrix must be perpendicular,
not parallel, to the line through the foci and the vertex.

That is a vertical directix, and

That says the line through these points is also vertical. One of

these is vertical and the other horizontal.  They cannot both be

vertical.  You may restate your peoblem correctly on the thank-you 

note form, and I will respond by email.



Edwin  

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