## Intermediate Algebra (12th Edition)

Published by Pearson

# Chapter 7 - Section 7.5 - Multiplying and Dividing Radical Expressions - 7.5 Exercises - Page 476: 75

#### Answer

$-\dfrac{\sqrt[3]{2pr}}{r}$

#### Work Step by Step

$\bf{\text{Solution Outline:}}$ To rationalize the given radical expression, $-\sqrt[3]{\dfrac{2p}{r^2}} ,$ multiply the numerator and the denominator by an expression equal to $1$ which will make the denominator a perfect power of the index. $\bf{\text{Solution Details:}}$ Multiplying the numerator and the denominator by an expression equal to $1$ which will make the denominator a perfect power of the index results to \begin{array}{l}\require{cancel} -\sqrt[3]{\dfrac{2p}{r^2}\cdot\dfrac{r}{r}} \\\\= -\sqrt[3]{\dfrac{2pr}{r^3}} .\end{array} Using the Quotient Rule of radicals which is given by $\sqrt[n]{\dfrac{x}{y}}=\dfrac{\sqrt[n]{x}}{\sqrt[n]{y}}{},$ the expression above is equivalent to \begin{array}{l}\require{cancel} -\dfrac{\sqrt[3]{2pr}}{\sqrt[3]{r^3}} \\\\= -\dfrac{\sqrt[3]{2pr}}{r} .\end{array}

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