Find the condition for the line lx+my+n=0lx + my + n = 0lx+my+n=0 to be a normal to the parabola y2=4axy^2 = 4axy2=4ax.
al3+2alm2+nm3=0al^3 + 2alm^2 + nm^3 = 0al3+2alm2+nm3=0
al3+2alm2+nlm2=0al^3 + 2alm^2 + nlm^2 = 0al3+2alm2+nlm2=0
am3+2alm2+nl2m=0am^3 + 2alm^2 + nl^2m = 0am3+2alm2+nl2m=0
al3+2am2l+nl3=0al^3 + 2am^2l + nl^3 = 0al3+2am2l+nl3=0