For this case we have the following xpresion:

We can rewrite it as:

Where:

We must factor, for this we follow the steps below:
Step 1:
The term of the medium must be rewritten as the sum of two terms, whose sum is 7 and the product is
:
Then, the term of the medium, fulfilling the two previous conditions, can be written as:

We check:

So, we have:

Step 2:
The maximum common denominator (the largest integer that divides them without leaving residue) of each group is factored

Step 3:
We take common factor
:

Thus, the expression
can be factored as:

Answer:
