This applet will provide many equation of parabola symmetric with X axis.[br]You have to convert in the form (x-h)^2 = 4 a ( y-k)[br]Where (h,k) is the Vertex of Parabola.[br](h,k+a) is the Focus.[br]Equation to directrix y =k-a [br]Length of Latus Rectum is 4|a|.