A) [?1, 1]
B) \[(-\infty ,\,\,1)\]
C) \[[1,\,\,+\infty )\]
D) None of these
Correct Answer: B
Solution :
Let \[f(x)={{x}^{4}}-4x\Rightarrow f'(x)=4{{x}^{3}}-4\] So, \[4{{x}^{3}}-4<0\]or \[{{x}^{3}}<1\] Hence function of decreasing in \[(-\infty ,1)\].You need to login to perform this action.
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