Find the center of this ellipse: 9x^(2)+y^(2)+36x-4y+31=0

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Find the center of this ellipse: 9x^(2)+y^(2)+36x-4y+31=0

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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@lgbasallote or @satellite73 you know these?
not good with graphs sorry
http://www.cccg.ca/proceedings/2005/49.pdf http://mathcentral.uregina.ca/QQ/database/QQ.09.06/s/sima1.html' http://www.purplemath.com/modules/ellipse2.htm

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Other answers:

these are the worst references ever
9x^(2)+y^(2)+36x-4y+31=0 or, 9 (x^2+4x +4) +(y^2-4y+4)-9=0 or, 9(x+2)^2 + (y-2)^2 = 9 or, (x+2)^2 +(y-2)^2 /9 = 1.... see that the centre is (-2,2)
The purplemath.com reference is exactly what you need to do this.
what is wrong with @bhaweshwebmasters answer?
do you know how to complete the square? Thats all we are doing on these.

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