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 9 - Inequalities and Problem Solving - Review Exercises: Chapter 9 - Page 623: 29


$\left( -\infty, \dfrac{1}{4} \right]$

Work Step by Step

$\bf{\text{Solution Outline:}}$ The domain of the given function, $ f(x)=1-4x ,$ are all the values of $x$ for which the radicand is greater than or equal to $0.$ Express the answer in the interval notation. $\bf{\text{Solution Details:}}$ Since the radicand should be greater than or equal to zero, then \begin{array}{l}\require{cancel} 1-4x\ge0 \\\\ -4x\ge-1 .\end{array} Dividing both sides by a negative number (and consequently reversing the inequality symbol), the inequality above is equivalent to \begin{array}{l}\require{cancel} -4x\ge-1 \\\\ x\le\dfrac{-1}{-4} \\\\ x\le\dfrac{1}{4} .\end{array} Hence, the domain is $ \left( -\infty, \dfrac{1}{4} \right] .$
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