1.

If the equation 2hxy + 2gx + 2fy + c = 0 represents two straight lines, show that they form a rectangle of area (|fg|)/(h^2) with the co-ordinate axes.

Answer»

`(|f|)/(g^(2))`
`(|FH|)/(g^(2))`
`(|fg|)/(H^(2))`
`(|GH|)/(f^(2))`

Answer :C


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