1.

If ax^(2)+2hxy+by^(2)+2gx+2fy+c=0represents parallel lines then

Answer»

`sqrt(G^(2)-AC)/(H^(2)+a^(2))`
`sqrt(g^(2)-ac)/(h^(2)+a^(2))`
`2sqrt(g^(2)-ac)/(a(a+b))`
`sqrt(g^(2)+ac)/(a(a+b))`

ANSWER :C


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