College Algebra (11th Edition)

Published by Pearson
ISBN 10: 0321671791
ISBN 13: 978-0-32167-179-0

Chapter R - Section R.7 - Radical Expressions - R.7 Exercises - Page 68: 86

Answer

$\dfrac{\sqrt[3]{4}}{2}$

Work Step by Step

$\bf{\text{Solution Outline:}}$ To simplify the given expression, $ \dfrac{\sqrt[3]{8m^2n^3}\cdot\sqrt[3]{2m^2}}{\sqrt[3]{32m^4n^3}} ,$ use the laws of radicals and the laws of exponents. Rationalize the denominator when necessary. $\bf{\text{Solution Details:}}$ Using the Product Rule of radicals which is given by $\sqrt[m]{x}\cdot\sqrt[m]{y}=\sqrt[m]{xy},$ the expression above is equivalent to\begin{array}{l}\require{cancel} \dfrac{\sqrt[3]{8m^2n^3(2m^2)}}{\sqrt[3]{32m^4n^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} \sqrt[3]{\dfrac{8m^2n^3(2m^2)}{32m^4n^3}} .\end{array} Using the Product Rule of the laws of exponents which is given by $x^m\cdot x^n=x^{m+n},$ the expression above is equivalent to \begin{array}{l}\require{cancel} \sqrt[3]{\dfrac{16m^{2+2}n^3}{32m^4n^3}} \\\\= \sqrt[3]{\dfrac{16m^{4}n^3}{32m^4n^3}} \\\\= \sqrt[3]{\dfrac{\cancel{16}\cancel{m^{4}n^3}}{\cancel{32}^2\cancel{m^{4}n^3}}} \\\\= \sqrt[3]{\dfrac{1}{2}} .\end{array} Rationalizing the denominator results to \begin{array}{l}\require{cancel} \sqrt[3]{\dfrac{1}{2}\cdot\dfrac{4}{4}} \\\\= \sqrt[3]{\dfrac{1}{8}\cdot4} \\\\= \sqrt[3]{\left(\dfrac{1}{2}\right)^3\cdot4} \\\\= \dfrac{1}{2}\sqrt[3]{4} \\\\= \dfrac{\sqrt[3]{4}}{2} .\end{array}
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