The only things we can simplify in this expression are teh powers of two, and taking common factor in xyz:
[tex]xyz\sqrt[3]{3}+2^4xyz+2^8xy=xyz\sqrt[3]{3}+16xyz+256xy=xyz(\sqrt[3]{3}+16)+2^8xy[/tex]
The simplified expression is:
[tex]xyz(\sqrt[3]{3}+16)+2^8xy[/tex]
