Expression involving a power of 1.5

Question

How do you simplify

u^1.5

in root form?

^0.5 is the root of u but im confused with 1.5

Please help

Thankyou

Answer 1

$$u^{1.5}=u^{\frac{3}{2}}=\sqrt{u^3}=|u|\sqrt{u}$$

Answer 2

In general for $a,b$ positive integer

$$u^{\frac a b}= \sqrt[b]{u^a}$$