The circle C C\,C has equation x2+y2+8x−4y−14=0x^2 + y^2 + 8x - 4y - 14 = 0x2+y2+8x−4y−14=0
Complete both squares and use the result to give the centre and exact radius of CCC.
Show that the point (1,5)(1, 5)(1,5) lies on CCC.