conic-section

Question: The line $lx+my+n=0$ will touch the parabola ${{y}^{2}}=4ax$ , if



1) $mn=a{{l}^{2}}$
2) $lm=a{{n}^{2}}$
3) $ln=a{{m}^{2}}$
4) $mn=al$
Solution: Explanation: No Explanation
Parabola

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