1.

If the pair of lines ax^(2)+2hxy+by^(2)+2gx+2fy+c=0 intersect on the y-axis, then 2fgh=

Answer»

`AF^(2)+ch^(2)`
`bg^(2)+ch^(2)`
`af^(2)+bg^(2)`
`bg^(2)+h^(2)`

ANSWER :B


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