Question 254979
{{{y=+-sqrt(9-(x-4)^2) - 2}}}
add 2 to get
{{{y + 2 = +-sqrt(9-(x-4)^2)}}}
square both sides to get
{{{(y+2)^2 = 9-(x-4)^2}}}
add (x-4)^2 to both sides to get
{{{(x-4)^2 + (y+2)^2 = 9}}}
center = (4,-2) with radius of 3