Respuesta :

[tex](5\cdot x^9)^4[/tex]

Separate the product

[tex]5^4\cdot(x^9)^4[/tex]

simplify both terms

[tex]\begin{gathered} (5\cdot5\cdot5\cdot5)\cdot x^{36} \\ 625x^{36} \end{gathered}[/tex]