anonymous
  • anonymous
Find the vertices, foci and eccentricity of the ellipse. 9x^2 + y^2 = 81
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
Rewrite it in standard form.
anonymous
  • anonymous
You don't need me when you have polpak :)
anonymous
  • anonymous
\[\frac{(x-h)^2}{a^2} + \frac{(y-k)^2}{b^2} = 1\]

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anonymous
  • anonymous
You should divide both sides by 81, you will have: \[{x^2 \over 9}+{y^2 \over 81}=1\]
anonymous
  • anonymous
Then rewrite 9 and 81 as the square of a and b, then you know the lengths of the major and minor axes.

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