Answer
$(2+n)(4-2n+n^2)$
Work Step by Step
Using $a^3+b^3=(a+b)(a^2-ab+b^2)$, or the factoring of the sum of $2$ cubes, the factored form of the given expression, $ 8+n^3
,$ is \begin{array}{l}\require{cancel}
(2+n)[(2)^2-2(n)+(n)^2]
\\\\=
(2+n)(4-2n+n^2)
.\end{array}