Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 6 - Sections 6.1-6.5 - Integrated Review - Expressions and Equations Containing Rational Expressions - Page 380: 22



Work Step by Step

Factoring the given expression, $ \dfrac{x}{2x+6}+\dfrac{5}{x^2-9} ,$ results to \begin{array}{l}\require{cancel} \dfrac{x}{2(x+3)}+\dfrac{5}{(x+3)(x-3)} .\end{array} Using the $LCD= 2(x+3)(x-3) $, the expression above simplifies to \begin{array}{l} \dfrac{(x-3)(x)+2(5)}{2(x+3)(x-3)} \\\\= \dfrac{x^2-3x+10}{2(x+3)(x-3)} \\\\= \dfrac{x^2-3x+10}{2(x^2-9)} \\\\= \dfrac{x^2-3x+10}{2x^2-18} .\end{array}
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