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 - 7.2 Simplifying Rational Expressions - 7.2 Exercises - Page 576: 82

Answer

a) $\frac{27 x^2-6 x-8}{3 x-2}= 9x+4$ b) $ (3 x-2)\cdot (9x+4)$

Work Step by Step

Given \begin{equation} \left(27 x^2-6 x-8\right) \div(3 x-2). \end{equation} Use long division. $$ \begin{array}{r} 9x+4\phantom{)} \\ 3 x-2{\overline{\smash{\big)}\,27 x^2-6 x-8\phantom{)}}}\\ \underline{-~\phantom{(}(27x^2-18x)\phantom{-b)}}\\ 0+12x-8\phantom{)}\\ \underline{-~\phantom{()}(12x-8)}\\ 0\phantom{)} \end{array} $$ a) The solution is \begin{equation} \frac{27 x^2-6 x-8}{3 x-2}= 9x+4. \end{equation} b) The prime factor decomposition is $$ (3 x-2)\cdot (9x+4).$$
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