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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 concurrent at

A

(2,3)

B

(-2,-3)

C

Both (a) and (b)

D

none of these

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The correct Answer is:
C
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