Answer
$x^{12}$
Work Step by Step
Using $x^a \cdot x^b=x^{a+b}$ or the product rule, the given expression, $
x^4\cdot x^3\cdot x^5
,$ simplifies to
\begin{array}{l}\require{cancel}
x^{4+3+5}
\\\\=
x^{12}
.\end{array}
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