SOLUTION: x^2+12x+y^2+4y+31=0 find the radius and center,how do I go about doing this

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Question 979949: x^2+12x+y^2+4y+31=0 find the radius and center,how do I go about doing this
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Complete The Squares for the x and for the y (if necessary), and then you can do arithmetic to put the equation into standard form. The radius and center can be read from the standard form equation.

This lesson contains instruction on how to Complete the Square:
http://www.algebra.com/my/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev