The circle C C\,C has equation x2+y2−6x+2y−6=0x^2 + y^2 - 6x + 2y - 6 = 0x2+y2−6x+2y−6=0
Find the coordinates of the centre of C C\,C and the radius of CCC.
C C\,C crosses the yyy-axis at the points A A\,A and BBB. Find the coordinates of A A\,A and BBB, giving your answers in exact form.