[" 3.If the quadratic equation "ax^(2)+b...

[" 3.If the quadratic equation "ax^(2)+bx+c=0" has "-2" as one of its roots then "ax+by+c=0" represents "],[[" (A) family of concurrent lines "," (B) A family of parallel lines "],[" (C) single line "," (D) A line perpendicular to x-axis "]]

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