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Let a in R and let f: R to R be given b...

Let a `in R` and let f: `R to R` be given by f(x) `=x^(5) -5x+a.` then

A

`f(x)` has three real roots if `a gt4`

B

`f(x)` has only one real root if `a gt4`

C

`f(x)` has thre real roots if `a lt -4`

D

`f(x)` has three real roots if `-4 lt alt 4`

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The correct Answer is:
b,d
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