Answer
$6k^3-3k^2-2k$
Work Step by Step
Removing the grouping symbols and then combining like terms, the given expression, $
(4k^3+k^2+k)+(2k^3-4k^2-3k)
,$ simplifies to
\begin{array}{l}\require{cancel}
4k^3+k^2+k+2k^3-4k^2-3k
\\\\=
(4k^3+2k^3)+(k^2-4k^2)+(k-3k)
\\\\=
6k^3-3k^2-2k
.\end{array}
