The graph of x 2 − 2x + y 2 + 10y = 0 is a circle. Find the radius of this circle.
x^2 - 2x + y^2 + 10y = 0 complete the square on x , y
x^2 - 2x + 1 + y^2 + 10y + 25 = 1 + 25
(x - 1)^2 + ( y + 5)^2 = 26
26 = r^2
sqrt (26) = r
