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ax^(2) + 2hxy + by^(2) + 2 gx + 2fy + c=...

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

A

`abc+ 2fgh - af^(2) - bg^(2) - ch^(2) =0`

B

a+b=0

C

`h^(2) = ab , af^(2) = bg^(2) `

D

`h^(2)=ab,af^(2) + bg^(2) =0`

Text Solution

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The correct Answer is:
C
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