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Posted by **ladybug** on Thursday, October 25, 2012 at 10:31pm.

x^2 + y^2 + 4x + 2y - 20 = 0

- college algebra -
**Reiny**, Thursday, October 25, 2012 at 10:48pmcomplete the square

x^2 + 4x**+ 4**+ y^2 + 2y**+ 1**= 20**+ 4****+ 1**

(x+2)^2 + (y+1)^2 = 25

I will let you handle the rest, since this is a very basic result.

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