Answer
$... =x^{5}\cdot x^{5}\cdot x^{5}\cdot x^{5}=x^{5+5+5+5}=x^{5\cdot 4}=x^{20}$
Work Step by Step
$(x^{5})^{4}=x^{5}\cdot x^{5}\cdot x^{5}\cdot x^{5}=x^{5+5+5+5}=x^{5\cdot 4}=x^{20}$
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