Answer
$(m-3)^{9}$
Work Step by Step
Since $a^x\cdot a^y=a^{x+y}$, then the given expression, $
(m-3)^4(m-3)^{5}
$, simplifies to
\begin{array}{l}\require{cancel}
(m-3)^{4+5}
\\\\=
(m-3)^{9}
.\end{array}
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