$\"\"$

The polynomial expression is $\"\"$ .

To find the GCF in above binomial expression $\"\"$ .

Factors of 81: 3, 9, 27, 81.

Factors of $\"\"$ : 2, 4, 8, 16 k, k².

There is no common factors.

Thus, $\"\"$ is a prime polynomial. $\"\"$

The polynomial is a prime.