Consider the following function.

$f(x)=(x-8{)}^{\frac{2}{3}}$

Find the derivative of the function.

$f^{\text{'}}(x)=$

$$

Find all the values of $x$ for which $f^{\text{'}}(x)=0$ or $f^{\text{'}}(x)$ is'discontinuous. $($Enter your answers as a comma$-$separated list.$)$

$x=$

increasing $$

decreasing $$