To use the Associative Property to group like terms in the expression \( 9x + (2x + 3) \), we can rearrange the terms while keeping their values unchanged.
We can identify the like terms \( 9x \) and \( 2x \). Therefore, we can group them together as follows:
\[ (9x + 2x) + 3 \]
So, the expression grouped using the Associative Property is:
\[ (9x + 2x) + 3 \]
This keeps the terms organized without simplifying any parts.