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If ax^2+2hxy+by^2+2gx+2fy+c=0 represents...

If `ax^2+2hxy+by^2+2gx+2fy+c=0` represents a pair of parallel lines then sqrt([q^2-ac/f^2-bc])=

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The correct Answer is:
`root(2)((f^(2)-bc)/(b(a+b)))`
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