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

Results 1 to 8 of 8

- May 30th 2009, 08:34 AM #1

- Joined
- Apr 2007
- Posts
- 43

- May 30th 2009, 11:05 AM #2

- May 30th 2009, 04:27 PM #3

- May 30th 2009, 04:38 PM #4

- May 30th 2009, 11:26 PM #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, 04:59 AM #6

- Joined
- Mar 2007
- Posts
- 1,240

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, 06:42 AM #7

- May 31st 2009, 07:04 AM #8

- Joined
- Apr 2005
- Posts
- 15,707
- Thanks
- 1470