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The set of all values of a for which the...

The set of all values of a for which the function
`f(x)=(sqrt(a+4)/(1-a)-1)x^5-3x+log5` decreases for all real x is

A

`(-oo,oo)`

B

`[-4,(3-sqrt(21))/2]uu(1,oo)`

C

`(-3,(5-sqrt(21))/2)uu(2,oo)`

D

`[1,oo)`

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The correct Answer is:
B
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PATHFINDER-APPLICATION OF DERIVATIVE-QUESTION BANK
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