Answer :
Given,
The expression is ( + )(2 + 3) − ( + )( + 1).
Simplifying the expression,
[tex]\begin{gathered} \mleft(+\mright)\mleft(2+3\mright)-(+)\mleft(+1\mright). \\ (a+b)((2a+3b)-(a+1)) \\ (a+b)(2a+3b-a-1) \\ (a+b)(a+3b-1) \end{gathered}[/tex]Hence, the expression is (a+b)(a+3b-1).