Question 206830
you need to COMPLETE THE SQUARE for the x's and y's


you're on the right track, but you need different constant terms


the first order terms (-10x and 4y) determine the constants


x^2 - 10x + 25 = (x - 5)^2


y^2 +4y + 4 = (y + 2)^2


(x^2 - 10x + 25) + (y^2 + 4y + 4) = -13 + 25 + 4 = 16


(x - 5)^2 + (y + 2)^2 = 4^2