Evaluate the following.
Click on "Not a real number" if applicable.
(a) $\sqrt[4]{-81}=\square$
(b) $\sqrt[3]{-64}=\square$

Answer

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Answer

$\boxed{-4}$ is the final answer for $\sqrt[3]{-64}$

Steps

Step 1 ：$\sqrt[4]{-81}$ is not a real number because the fourth root of a negative number is not defined in the real number system.

Step 2 ：$\sqrt[3]{-64} = -4$ because $-4^3 = -64$

Step 3 ：$\boxed{-4}$ is the final answer for $\sqrt[3]{-64}$