Perform the indicated operations. Assume all variables represent positive values.


16x5y64+9xxy648yx5y24\displaystyle {\sqrt[{{4}}]{{{16}{x}^{{5}}{y}^{{6}}}}}+{9}{x}{\sqrt[{{4}}]{{{x}{y}^{{6}}}}}-{8}{y}{\sqrt[{{4}}]{{{x}^{{5}}{y}^{{2}}}}}