Answer
$-7r^3t^4(3r^2+2rt^2-3t^2)$
Work Step by Step
Factoring the negative $GCF=
-7r^3t^4
$, the factored form of the given expression, $
-21r^5t^4-14r^4t^6+21r^3t^6
,$ is
\begin{align*}
-7r^3t^4(3r^2+2rt^2-3t^2)
.\end{align*}
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