Answer
$8^{7}$
Work Step by Step
Since $a^x\cdot a^y=a^{x+y}$, then the given expression, $
8^4\cdot 8^{3}
$, simplifies to
\begin{array}{l}\require{cancel}
8^{4+3}
\\\\=
8^{7}
.\end{array}
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