(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Given the ellipse is centered at the origin and the information, find an equation of the ellipse.

1) An ellipse with focus ([tex]\sqrt{5}[/tex],0), directrix; x = [tex]\frac{9}{\sqrt{5}}[/tex]

2) An ellipse with an eccentricity of 4/5

3. The attempt at a solution

I have to leave right now so I can't post a usuall good attept, but basically for #1) you cannot match the directrix with the a/e, but for #2) you are supposed to take the focus = 4

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# Homework Help: Why is it wrong to conclude a isn't the vertice (conics)

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