# The center of circle

• April 21st 2012, 10:07 AM
Mhmh96
The center of circle
The equation of a circle is x^2+6x+y^2-2y=12 ,what is the center ?
• April 21st 2012, 10:15 AM
a tutor
Re: The center of circle
You need to complete the square. I'll do the x bit $x^2+6x=(x+3)^2-9$
• April 21st 2012, 10:18 AM
Mhmh96
Re: The center of circle
I forgot how to complete the square ,i will search that .
• April 21st 2012, 10:43 AM
Mhmh96
Re: The center of circle
Aha so the answer should be (-3,1).
• April 21st 2012, 10:50 AM
a tutor
Re: The center of circle
You got it.

(Clapping)