Answer
$18x$
Work Step by Step
We start with the given expression: $9(2x)$
The associative property of multiplication states that changing the grouping of the factors does not affect the product.
We use this property to group the factors differently: $(9\times2)\times x$
We use the order of operations to simplify.
We simplify inside the parentheses with multiplication: $18\times x$
We multiply: $18x$