Hi I have this question:

$\displaystyle \sqrt{4x^3}$

so I cann use the power rule to rewrite this question correct? so it would be like so:

$\displaystyle 2\sqrt{x^3} $

It is the next step I'm confused about.

$\displaystyle 2(x^3)^\frac{1}{ 2} $

how do you get the 1/2 exponent?