Question 183340
First thing you need to do is review the formula for a circle.
See this URL --> http://www.mathwarehouse.com/geometry/circle/equation-of-a-circle.php

Once you have read that, the equation you were given is in that form already.
So you just need to "pick the center and radius' directly from the equation

Center (H,K) = (9,-1)
radius r^2 = 49 so r = 7