Table

Table 2: TABLE 2

Interval	Sign of $4x$	Sign of $(x^{2}-1) ^{1/3}$	Sign of $f'\left( x \right) = \frac{{4x}}{{3{{\left( {{x^2} - 1} \right)}^{1/3}}}}$	Conclusion
$( -\infty ,-1)$	Negative $(-)$	Positive $(+)$	Negative $(-)$	$f$ is decreasing on $(-\infty,-1)$
$(-1,0)$	Negative $(-)$	Negative $(-)$	Positive $(+)$	$f$ is increasing on $(-1,0)$
$(0,1)$	Positive $(+)$	Negative $(-)$	Negative $(-)$	$f$ is decreasing on $(0,1)$
$(1,\infty)$	Positive $(+)$	Positive $(+)$	Positive $(+)$	$f$ is increasing on $(1,\infty)$