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 R - Elementary Algebra Review - R.6 Rational Expressions and Equations - R.6 Exercise Set - Page 980: 31


The simplified form of the rational expression $\frac{x-y}{2x}\cdot \frac{3{{x}^{2}}}{y-x}$ is $-\frac{3x}{2}$.

Work Step by Step

$\frac{x-y}{2x}\cdot \frac{3{{x}^{2}}}{y-x}$ Obtain the alternative form of the expression by multiplying the rational expression $\frac{3{{x}^{2}}}{y-x}$ by 1 in the form $\frac{-1}{-1}$. So, $\begin{align} & \frac{x-y}{2x}\cdot \frac{3{{x}^{2}}}{y-x}=\frac{x-y}{2x}\cdot \frac{3{{x}^{2}}}{y-x}\cdot \frac{-1}{-1} \\ & =\frac{x-y}{2x}\cdot \frac{-3{{x}^{2}}}{x-y} \end{align}$ Regroup and remove the factor equal to 1, $\begin{align} & \frac{x-y}{2x}\cdot \frac{3{{x}^{2}}}{y-x}=\frac{x-y}{x-y}\cdot \frac{-3x\cdot x}{2\cdot x} \\ & =1\cdot \frac{x}{x}\cdot \frac{-3x}{2} \\ & =1\cdot \frac{-3x}{2} \\ & =-\frac{3x}{2} \end{align}$
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