Question 24554
THE GENERAL EQN. OF PARABOLA WITH VERTEX AT ORIGIN IS GIVEN BY 
Y^2=4AX.....WHERE DIRECTRIX IS GIVEN BY 
Y+A=0.....WHICH IS GIVEN AS Y=-3..OR...Y+3=0...OR A=3
HENCE 
EQN.OF PARABOLA IS 
Y^2=4*3*X=12X