Intermediate Algebra for College Students (7th Edition)

$\sqrt[n]{ab}$
RECALL: The product rule states that if $\sqrt[n]{a}$ and $\sqrt[n]{b}$ are real numbers, then $\sqrt[n]{a} \cdot \sqrt[n]{b} = \sqrt[n]{ab}$. Thus, the missing expression in the given statement is $\sqrt[n]{ab}$.