5ab(xa⁴+ya⁵-8)

It looks like you've provided an expression. If you're looking to simplify or factor it, here’s a concise breakdown:

The expression $5ab(xa^4 + ya^5 - 8)$ is already in a factored form, where $5ab$ is a common factor multiplied by the polynomial $(xa^4 + ya^5 - 8)$.

If you need further assistance, such as expanding or evaluating it, please specify!