1.

ax^(2)+2hxy+by^(2)+2gx+2fy+c=0 represents two parallel straight lines if

Answer»

`SQRT((g^(2)-AC)/(h^(2)+a^(2)))`
`2sqrt((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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