Function \[f(x)=\frac{4{{x}^{2}}+1}{x}\] is decreasing for interval

1.	Function \[f(x)=\frac{4{{x}^{2}}+1}{x}\] is decreasing for interval
A.	\[\left( \frac{-1}{2},\,\frac{1}{2} \right)\]
B.	\[\left[ \frac{1}{2},\,-\frac{1}{2} \right]\]
C.	(? 1, 1)
D.	[1, ?1]
Answer» C. (? 1, 1)

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Function \[f(x)=\frac{4{{x}^{2}}+1}{x}\] is decreasing for interval

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