The condition that the equation ax^(2) +...

The condition that the equation `ax^(2) + 2hxy + by^(2) + 2gx + 2fy +c=0` can take the form `ax^(2) - 2hxy + by^(2)=0`, when shifting the origi is

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The correct Answer is:

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

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