Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 9 - Systems and Matrices - Chapter 9 Test Prep - 955 - Page 955: 49

Answer

$\dfrac{2}{x-1}-\dfrac{6}{3x-2} $

Work Step by Step

We will write the partial decomposition as: $\dfrac{2}{(x-1)(3x-2)}=\dfrac{A}{x-1}+\dfrac{B}{3x-2} ~~~~(a)$ This implies that $2=A(3x-2)+B (x-1)$ Plug $x=1$ to obtain: $A=2$ Now, plug $x=\dfrac{3}{2}$ to obtain: $B=-6$ So, the equation (a) becomes: $\dfrac{2}{(x-1)(3x-2)}=\dfrac{2}{x-1}-\dfrac{6}{3x-2} $
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