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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

Less than 4 ab

B

Greater than -4ab

C

Less than -4 ab

D

Greater than 4 ab

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The correct Answer is:
B
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VMC MODULES ENGLISH-QUADRATIC EQUATIONS & INEQUATIONS -LEVEL -2
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