What is the eccentricity of an ellipse 9x2+y2+18x-12y-180=0

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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What is the eccentricity of an ellipse 9x2+y2+18x-12y-180=0?

a. 0.789          b.0.897                       

b. 0.943          d. 0.576

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