$\"\"$

The expression is $\"\"$ .

Complete the factor.

$\"\"$ (Original expression)

$\"\"$ (Factor out the GCF)

$\"\"$ (Simplfy)

Since $\"\"$ and $\"\"$ are both perfect cubes, so can be factor the sum of cubes.

$\"\"$ (Difference of two cubes)

$\"\"$ (Difference of two squares)

The simplified expression is $\"\"$ .

$\"\"$

The factor form is $\"\"$ .