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Let f(x) = ax^(3) + bx^(2) + cx + d, a !...

Let f(x) `= ax^(3) + bx^(2) + cx + d, a != 0`, where a, b, c, `d in R`. If f(x) is one-one and onto, then which of the following is correct ?

A

`b^(2) < 3ac`

B

`b^(2) = 3ac`

C

`b^(2) ge 3ac`

D

`b^(2)=3c`

Text Solution

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The correct Answer is:
A
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