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If 4A^(2)+9B^(2)-C^(2)+12AB=0, then the ...

If `4A^(2)+9B^(2)-C^(2)+12AB=0`, then the family of straight lines `Ax+By+C=0` is either concurrent at…….or at………..

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The correct Answer is:
(2,3),(-2,-3).
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