Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Another College Algebra Question?
The question is:
x^2 + y^2 - 12x -2y +21 = 0
(That's x and y squared)
How do I find the center and the radius?
Thank You!
1 Answer
- hayharbrLv 71 decade agoFavorite Answer
You complete the squares for x and y, and move the constant terms to the right of the = sign. Eventually this constant term will be radius squared.:
x^2 - 12x + y^2 - 2y = -21
(x - 6)^2 [gives an extra 36] + (y - 1)^2 [gives an extra 1] = -21 + 36 + 1
(x - 6)^2 + (y - 1)^2 = 16
so center = (6,1) and radius = 4
