Question 979949
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:
<a href="http://www.algebra.com/my/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev">http://www.algebra.com/my/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev</a>