conic-section

Question: The line $lx+my+n=0$ will be a tangent to the hyperbola $\frac{{{x}^{2}}}{{{a}^{2}}}-\frac{{{y}^{2}}}{{{b}^{2}}}=1$, if



1) ${{a}^{2}}{{l}^{2}}+{{b}^{2}}{{m}^{2}}={{n}^{2}}$
2) ${{a}^{2}}{{l}^{2}}-{{b}^{2}}{{m}^{2}}={{n}^{2}}$
3) $a{{m}^{2}}-{{b}^{2}}{{n}^{2}}={{a}^{2}}{{l}^{2}}$
4) None of these
Solution: Explanation: No Explanation
Hyperbola

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