Question: If the roots of the equation $b x^{2}+c x+a=0$ be imaginary, then for all real values of $x$, the expression $3 b^{2} x^{2}+6 b c x+2 c^{2}$ is :-
Greater than $-4 a b$
Less than $-4 a b$
Greater than $4 a b$
Less than $4 a b$
Correct Option: 1
Solution:
