Question

Thinking the perimeter of the rectangle is 3x + 2 + x + 3x + 2 + X.

Answer 1

They are both right because the first expression is the perimeter but expanded in terms of length.The second expression is shortened to be a factor expression but they both represent the length.
The benefit of the first one is you can see how it’s expanded and plug the numbers in and the second one is more easy to plug in the numbers with ease.