convert the given equation into the form [tex] (x-h)^{2} [/tex] + [tex] (y-k)^{2} [/tex] = [tex] r^{2} [/tex] where the center is (h,k) and r is the radius
in order to achieve this, use completing the square on the y value, the formula is (b/a)^2
so, youll have [tex] (x)^{2} [/tex] + [tex] (y)^{2} [/tex]-8y + 16= 0+9 +16
add sixteen to the other side too so that you will not violate the equality law
then use factoring, youll get
(x)^{2} [/tex] + [tex] (y-4)^{2} [/tex] = 25
so, (0,4) as center and 5 as radius
