Hey everyone,

Okay so i'm going through some past papers now as exams are starting to approach and Im struggling with a few question but there is one inperticular thats really confused me. Could you help me please?

The circle C, with centre at the point A, has equation x^2 + y^2 - 10x + 9 = 0.

Find

(a) The coordinates of A

(b) The radius of C

(c) the coordinates of the points at which C crosses the x-axis.

Ive stared and stared at this question and dont truely know where to begin. I know how to find the coordinates of the centre point when its in the form (x-a)^2 + (y-b)^2 = r^2, so my first thought was to arrange this equation into this form, but it seems im having trouble doing this. Im not sure if im thinking in the right direction or not. It could be staring me in the face.

Hope you can help

Steve