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

\[a{{l}^{2}}+b{{m}^{2}}={{n}^{2}}\]

\[{{a}^{2}}{{l}^{2}}+{{b}^{2}}{{m}^{2}}={{n}^{2}}\]

The line \[lx+my-n=0\] will be tangent to the ellipse \[\frac{{{x}^{2}

1.	The line \[lx+my-n=0\] will be tangent to the ellipse \[\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1\], if
A.	\[{{a}^{2}}{{l}^{2}}+{{b}^{2}}{{m}^{2}}={{n}^{2}}\]
B.	\[a{{l}^{2}}+b{{m}^{2}}={{n}^{2}}\]
C.	\[{{a}^{2}}l+{{b}^{2}}m=n\]
D.	None of these
Answer» B. \[a{{l}^{2}}+b{{m}^{2}}={{n}^{2}}\]

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

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