Answer
$-x^4(x^2-2x+7)$
Work Step by Step
Factoring the negative $GCF=
-x^4
$, then the given expression, $
-x^6+2x^5-7x^4
$ is equivalent to
\begin{array}{l}
-x^4(x^2-2x+7)
.\end{array}
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