Final answer to the problem
$\sqrt{\left(x-1\right)^{3}}$
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Step-by-step Solution
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When multiplying exponents with same base you can add the exponents: $\sqrt{x-1}\left(x-1\right)$
$\sqrt{\left(x-1\right)^{3}}$
Final answer to the problem
$\sqrt{\left(x-1\right)^{3}}$