Joint Entrance Examination/AIEEE 2009/Q001 equations

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If the roots of the equation bx²+cx+a=0 be imaginary, then for all real values of x, the expression 3b²x²+6bcx+2c² is

(1) less than –4ab
(2) greater than 4ab
(3) less than 4ab
(4) greater than –4ab

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