To apply the Associative Property and group like terms in the expression \(9x + (2x + 3)\), you can rearrange the terms without changing their sum.
You can rewrite it as:
\[ (9x + 2x) + 3 \]
This groups the like terms \(9x\) and \(2x\) together. Thus, the expression grouped using the Associative Property is:
\[ (9x + 2x) + 3 \]