Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 10 - Exponents and Radicals - 10.1 Radical Expressions and Functions - 10.1 Exercise Set: 124

Answer

$(-4,5]$

Work Step by Step

$\bf{\text{Solution Outline:}}$ The domain of the given function, $ g(x)=\dfrac{\sqrt[4]{5-x}}{\sqrt[6]{x+4}} ,$ are the combined restrictions of the numerator and the denominator. $\bf{\text{Solution Details:}}$ In the numerator, since the radicand of a radical with an even index (index equals $ 4 $), should be nonnegative, then \begin{array}{l}\require{cancel} 5-x\ge0 \\\\ -x\ge-5 \\\\ x\le\dfrac{-5}{-1} \\\\ x\le5 .\end{array} In the denominator, since the radicand of a radical with an even index (index equals $ 6 $), should be nonnegative, and that the denominator cannot be zero, then \begin{array}{l}\require{cancel} x+4\gt0 \\\\ x\gt-4 .\end{array} Combining the two restrictions above, then the domain is the interval $ (-4,5] .$
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