Q: Why can't I plot (x+2)^{1/3} properly using pgfplots? I'm using the code 
\documentclass{book}
\usepackage{pgfplots}
\begin{document}

\begin{tikzpicture}
\begin{axis}[
        xmin=-5,
        xmax=5,
        ymin=-5,
        ymax=5,
        axis x line=middle,
        axis y line=middle,
        samples=100,
        domain=-5:5,
    ]
        \addplot[thick](x,{(x+2)^(1/3)});
\end{axis} 
\end{tikzpicture}

\end{document}

to plot y= (x+2)^{1/3} which gives me this graph:

but it is not complete, because the right graph is:  

How can I plot it like the second screenshot? 
