Simplify $\displaystyle {11}{\sqrt[{{4}}]{{{16}{x}}}}-{8}{\sqrt[{{4}}]{{{256}{x}}}}$ completely. Write answer in radical form. Assume $\displaystyle {x}>{0}$.

Answer =
Preview Question 6  

Entry Tip: To enter an answer like $\displaystyle {50}{\sqrt[{{3}}]{{{19}{x}}}},$ you would type 50*root(3)(19x). Preview your answer before submitting!