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$\sqrt[4]{256 x^{32}}=$ $\square$$\newline$The root is not a real num$\newline$Note that the radicand is nonnegative, so the fourth root is a real number.$\newline$To simplify $\sqrt[4]{81 x^{36}}$, find an expression such that, when it is raised to fourth p$\newline$$\left(3 x^{9}\right)^{4}=81 x^{36}$$\newline$Thus, $\sqrt[4]{81 x^{36}}=3 x^{9}$.