Circles and Hyperbolas, SMB-016 Find the centre and radius of the circle with the equation `x^2+ y^2+8y= 0` (2 marks) Show Answers Only `text(Centre)\ (0,-4)` `text(Radius = 4)` Show Worked Solution `x^2+ y^2+8y` `= 0` `x^2+ y^2+8y+16-16` `= 0` `x^2+(y+4)^2` `= 4^2` `:.\ text(Centre)\ (0,-4)` `:.\ text(Radius = 4)`