Step 1:

The function is .

Differentiate with respect to .

Find the critical number by equating to zero.

Step 2:

Critical point is .

Since the function is cube root function, So we do not consider negative values of .

Test intervals are  .

Interval	Test Value	Sign of	Conclusion
		\   \ \	Decreasing
		\   \ \	Increasing

Thus, the function is decreasing on the interval and increasing on the interval .

Solution:

The function is increasing on interval .