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

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**(a) Evaluation of $$ \sqrt[4]{-81} $$:**

1. Since the index $$ 4 $$ is even, the fourth root of a negative number is not a real number.
2. Therefore, 
   $$
   \sqrt[4]{-81} \text{ is not a real number.}
   $$

**(b) Evaluation of $$ \sqrt[3]{-64} $$:**

1. Since the index $$ 3 $$ is odd, the cube root can be taken for a negative number.
2. We note that 
   $$
   (-4)^3 = -64.
   $$
3. Therefore, 
   $$
   \sqrt[3]{-64} = -4.
   $$
**(a) $$ \sqrt[4]{-81} $$ is not a real number.** **(b) $$ \sqrt[3]{-64} = -4 $$.

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

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