If the roots of the equation \( b x^{2}+c x+a=0 \) be imaginary then for all real values of \( \... VIDEO
If the roots of the equation \( b x^{2}+c x+a=0 \) be imaginary then for all real values of \( \mathrm{x} \), the expression \( 3 b^{2} x^{2}+6 b c x+ \) \( 2 c^{2} \) 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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