Answer
$x^{20}$
Work Step by Step
We are given the expression $(x^{4})^{5}$.
To simplify, we can use the power rule, which holds that $(a^{m})^{n}=a^{m\times n}$ (where a is a real number, and m and n are integers).
$(x^{4})^{5}=x^{4\times5}=x^{20}$
