x2 + y2 − 2x +10y +9 = 0
Complete the square on the $\displaystyle \displaystyle x$ terms, complete the square on the $\displaystyle \displaystyle y$ terms, and move any remaining constants to the RHS.
This will put the equation into the required form, i.e. $\displaystyle \displaystyle (x - h)^2 + (y - k)^2 = r^2$.