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Q.

If 4a2+9b2−c2+12ab=0 then the family of straight lines ax+by+c=0 is concurrent at

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a

(2,3) or (-2,-3)

b

(2,-3) or (-2,6)

c

(-2,-4) or (-2,3)

d

(2,5) or (-1,-5)

answer is A.

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(2a+3b)2−c2=0
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