## Intermediate Algebra (12th Edition)

$x^{17}$
According to the product rule for exponents, $a^{m}\times a^{n}=a^{m+n}$. We can extend this rule to multiply together three exponents. Therefore, $x^{3}\times x^{5}\times x^{9}=x^{3+5+9}=x^{17}$.