Answer
$2^3x^3$
Work Step by Step
$a^m \cdot a^n = a^{m+n}$
Use the rule above to obtain:
$(2x)^3=2x \cdot 2x \cdot 2x = (2 \cdot 2 \cdot 2)(x \cdot x \cdot x) = 2^3x^3$
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