Math Help - circles

1. circles

I need some help with a problem.If someone could explain on how to solve

Find the center and radius of the circle

x2 + y2 - 2x =0

2. You must complete the square for x and y $x^2 + y^2 - 2x = x^2 - 2x +1 - + y^2 = (x-1)^2 + y^2 -1 = 0$
$(x-1)^2 + (y-0)^2 = 1$