Joint Entrance Examination/AIEEE 2009/Q001 equations

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