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: 57

Answer

$\dfrac{x^2y\sqrt{xy}}{z}$

Work Step by Step

$\bf{\text{Solution Outline:}}$ To simplify the given expression, $ \sqrt{\dfrac{x^5y^3}{z^2}} ,$ find a factor of the radicand that is a perfect power of the index. Then, extract the root of that factor. $\bf{\text{Solution Details:}}$ Factoring the expression that is a perfect power of the index and then extracting the root result to \begin{array}{l}\require{cancel} \sqrt{\dfrac{x^4y^2}{z^2}\cdot xy} \\\\= \sqrt{\left( \dfrac{x^2y}{z} \right)^2\cdot xy} \\\\= \left|\dfrac{x^2y}{z}\right| \sqrt{xy} .\end{array} Since all variables are assumed to be positive, the expression above is equivalent to \begin{array}{l}\require{cancel} \dfrac{x^2y}{z}\sqrt{xy} \\\\= \dfrac{x^2y\sqrt{xy}}{z} .\end{array}
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