If the roots of the equation

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 :-

  1. Greater than $-4 a b$

  2. Less than $-4 a b$

  3. Greater than $4 a b$

  4. Less than $4 a b$

Correct Option: 1

Solution:

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