The common factors between the two expressions is 1.
What is a common factor?
A common factor is a number that may be divided by two without leaving a residue. Numbers frequently share more than one aspect in common.
In order to find the common factor between the two expressions, we need to write the terms in factors form. Therefore, both the expression can be written as,
As we can see that except for 1, there are no common factors in the two expressions.
Hence, the common factor between the two expressions is 1.