Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 7 - Rational Functions - 7.1 Rational Functions and Variation - 7.1 Exercises - Page 566: 38


$\text{all real numbers except }$ $ t=\left\{ -7,3 \right\} $

Work Step by Step

$\bf{\text{Solution Outline:}}$ The domain of the given rational function, $ h(t)=\dfrac{t-3}{(t-3)(t+7)} ,$ are the values of $ t $ which will NOT make the denominator equal to $0.$ $\bf{\text{Solution Details:}}$ Solving for the values of $ t $ that will make the denominator equal to $0$ results to \begin{array}{l}\require{cancel} (t-3)(t+7)=0 .\end{array} Equating each factor to zero (Zero Product Property), then \begin{array}{l}\require{cancel} t-3=0 \\\\\text{OR}\\\\ t+7=0 .\end{array} Solving each equation results to \begin{array}{l}\require{cancel} t-3=0 \\\\ t=3 \\\\\text{OR}\\\\ t+7=0 \\\\ t=-7 .\end{array} Hence, the domain is the set of $ \text{all real numbers except }$ $ t=\left\{ -7,3 \right\} .$
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