A line lx+my=n is normal to the ellipse x2a2+y2b2=1 under the conditio – InterviewSolution

1.	A line lx+my=n is normal to the ellipse x2a2+y2b2=1 under the condition n2(a2−b2)2(a2l2+b2m2)=k, then 7k=
Answer» A line $l x + m y = n$ is normal to the ellipse $\frac{x^{2}}{a^{2}} + \frac{y^{2}}{b^{2}} = 1$ under the condition $\frac{n^{2}}{(a^{2} - b^{2})^{2}} (\frac{a^{2}}{l^{2}} + \frac{b^{2}}{m^{2}}) = k,$ then $7 k =$

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