$$ \sqrt[3]{a}(\sqrt[3]{a^2}-\sqrt[3]{a^5}) $$
How can this be simplified? I can't find anything for doing the subtraction.
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$$
\begin{align} \sqrt[\Large 3]{a}\left(\sqrt[\Large 3]{a^2}-\sqrt[\Large 3]{a^5}\right) & = \sqrt[\Large 3]{a}\cdot \sqrt[\Large 3]{a^2} - \sqrt[\Large 3]{a}\cdot \sqrt[\Large3]{a^5} \\ \\
& = \sqrt[\Large 3]{a\cdot a^2} - \sqrt[\Large a]{a\cdot a^5} \\ \\
& = \sqrt[\Large 3]{a^3} - \sqrt[\Large 3]{a^6} \\ \\
& = a - \sqrt[\Large 3]{(a^2)^3} \\ \\
& = a \;\;- \;\;a^2 \\ \\
&
\end{align}
$$