Find: the co-ordinates of the focus and the vertex, the equations of axis, tangent at the vertex and directrix, the length of latus rectum of the parabola.

      Co-ordinates of focus are (0, -a) = 
      Co-ordinates of vertex are (0, 0)
      Equation of axis is x = 0 (y-axis)
      Equation of tangent at origin is y = 0 (x-axis)
      Equation of directrix is y - a = 0 or 
      Length of latus -rectum = 4a =