Question 419332
My guess is that you are trying to completely factor this expression.  If that is the case, then let's look at using a "grouping" technique for factoring.

{{{(x + 1) + (x^2 + x)}}}  Note that the last expression has a common factor of x which can be factored out leaving:

(x + 1) + x(x + 1)

Note, now there is a common factor of (x + 1) in both terms.  We can factor that out leaving:
(x + 1)(1 + x)

Rearranging the terms in the second factor (which you can do because addition is commutative), we have (x + 1)(x + 1) = {{{(x + 1)^2}}}