1.

If 4a^2+9b^2_c^2+12ab=0 then the family of straight lines ax+by+c=0 is concurrent at

Answer»

(2,3) or (-2,-3)
(2,-3) or (-2,6)
(-2,-4) or (-2,3)
(2,5) or (-1,-5)

ANSWER :A


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