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

Question

anonymous · Answer

@lgbasallote  or @satellite73  you know these?

lgbasallote · Answer

not good with graphs sorry

nottim · Answer

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

anonymous · Answer

these are the worst references ever

anonymous · Answer

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)

anonymous · Answer

The purplemath.com reference is exactly what you need to do this.

zzr0ck3r · Answer

what is wrong with @bhaweshwebmasters answer?

zzr0ck3r · Answer

do you know how to complete the square? Thats all we are doing on these.