How do you find the eccentricity of 4x^2 + 16y^2 + 8x +64y +4 = 0

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- May 30th 2009, 09:34 AM #1

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- May 30th 2009, 12:05 PM #2

- May 30th 2009, 05:27 PM #3

- May 30th 2009, 05:38 PM #4

- May 31st 2009, 12:26 AM #5
Thanks for your reply - but in my opinion:

1. there exist a**linear eccentricity**. That's the eccentricity I've calculated.

2. there exist a**numerical eccntricity**. Obviously this is the eccentricity you've had in mind.

(Remark: I translated the technical terms literally from German so maybe the English expressions differ a bit)

- May 31st 2009, 05:59 AM #6

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To confirm the formula they gave you in your book for the eccentricity of an ellipse, and for worked examples of how to find the eccentricity, try

**some online lessons**.

Then make sure that you*memorize*the formula before your next test!!

- May 31st 2009, 07:42 AM #7

- May 31st 2009, 08:04 AM #8

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