1.

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

Answer»

`(-OO,oo)`
`[-4,(3-sqrt(21))/2]cup(1,oo)`
`(1,oo)`
`[-3,(3-sqrt(27))/2]cup(2,oo)`

ANSWER :B


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