The condition that the straight-line lx ...

The condition that the straight-line `lx + my = n` may be a normal to the hyperbola `b^2x^2-a^2y^2 =a^2b^2` is:

A

`a^(2)/l^(2) + b^(2)/m^(2) = ((a^(2) + b^(2))^(2))/n^(2) `

B

`a^(2)/l^(2) - b^(2)/m^(2) = ((a^(2) + b^(2))^(2))/n`

C

`a^(2)/l^(2) - b^(2)/m^(2) = ((a^(2) + b^(2))^(2))/n `

D

none of these

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The correct Answer is:

b

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