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If the roots of the equation bx^(2)+cx+a...

If the roots of the equation `bx^(2)+cx+a=0` be imaginary then fro all real value4s of x the expression `3b^(2)x^(2)+6bcx+2c^(2)` is

A

greater than 4 a b

B

less than 4 a b

C

greater than -4 a b

D

less than -4 a b

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The correct Answer is:
C
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