exponents

For positive integers p and q, with $\frac{p}{q} \neq 1$, $(\frac{p}{q})^{\frac{p}{q}} = p^{(\frac{p}{q}-1)}$. Then,

For positive integers $p$ and $q$, with $\frac{p}{q} \neq 1$, $\left(\frac{p}{q}\right)^\frac{p}{q}= p^{\left(\frac{p}{q}-1\right)}$. Then,

If x satisfies the equation $4^{8x} = 256$, then x is equal to ________.

If x satisfies the equation $\rm 4^{8^x}=256$ , then x is equal to ______.