Solution:
Consider the following polynomial:
By grouping terms, we get that the above polynomial is equivalent to the following expression:
Now, we can apply common factor:
again, applying a common factor, we get:
Note that the left factor is a difference of squares, therefore, the above expression is equivalent to:
this is equivalent to:
So that, we can conclude that the factors of the given expression are:
and
and we can conclude that: