If the roots of the equation `b x^2+""c x""+""a""=""0` be imaginary, then for all real values of x, the expression `3b^2x^2+""6b c x""+""2c^2` is (1) greater than 4ab (2) less than 4ab (3) greater than `4a b` (4) less than `4a b`

Explanation

To solve the problem, we need to analyze the given quadratic equation and the expression provided.

### Given:
The quadratic equation is:
\[ b x^2 + c x + a = 0 \]
We are told that the roots of this equation are imaginary. This occurs when the discriminant \( D \) is less than zero:
\[ D = c^2 - 4ab < 0 \]
From this inequality, we can conclude:
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