Answer
$2x^3$
Work Step by Step
The $GCF$ of $
-2
$ and $
6
$ is $
2
.$
The $GCF$ of $
x^4
$ and $
x^3
$ is $
x^3
.$
Hence, the $GCF$ of the given expressions, $
-2x^4
\text{ and } 6x^3
,$ is
\begin{array}{l}\require{cancel}
2x^3
.\end{array}