Answer
$x^{16}$
Work Step by Step
We are given the expression $x^{7}\times x^{8} \times x$.
We can use the product rule, which holds that $a^{m}\times{a^{n}}=a^{m+n}$ (where a is a real number, and m and n are positive integers).
$x^{7+8+1}=x^{16}$