Explanation:
Based on the information given, it is hard to identify what the question is asking for as there is no connection made between the expression
and the side lengths of the rectangle.
But as the question have asked to factor it, let me assume that the given expression is the area of the rectangle.
can be simplified to
, which can be factored to:

And therefore each side length are likely to be (x+1) and (x-1).
However, this is just a likely prediction made based on the information given, and without further explanation, the answer might be incorrect and it must be revised.
*Additionally, the form
looks a little odd for me so just in case it was a typo and the actual expression was
, here is a factor for this expression as well.
(x-2)(x-1)
Hope this helped and feel free to leave a comment for any questions!