If the roots of the equation b x^2+""c x...

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`

A

greater than 4ab

B

less then 4ab

C

greater than - 4 ab

D

less than - 4ab

Text Solution

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The correct Answer is:

C

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