conic-section

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



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

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