The line `lx+my+n=0` intersects the curve `ax^2 + 2hxy + by^2 = 1` at the point P and Q. The circle on PQ as diameter passes through the origin. Then `n^2(a+ b)` equals (A) `l^2+m^2` (B) `2lm`(C) `l^2-m^2` (D) `4lm`A. `n^(2)(a+b)=l^(2)+m^(2)`B. `l^(2)(a+b)=n^(2)+m^(2)`C. `m^(2)(a+b)=l^(2)+n^(2)`D. none of these

The line `lx+my+n=0` intersects the curve `ax^2 + 2hxy + by^2 = 1` at

1.	The line `lx+my+n=0` intersects the curve `ax^2 + 2hxy + by^2 = 1` at the point P and Q. The circle on PQ as diameter passes through the origin. Then `n^2(a+ b)` equals (A) `l^2+m^2` (B) `2lm`(C) `l^2-m^2` (D) `4lm`A. `n^(2)(a+b)=l^(2)+m^(2)`B. `l^(2)(a+b)=n^(2)+m^(2)`C. `m^(2)(a+b)=l^(2)+n^(2)`D. none of these
Answer» Correct Answer - A

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