Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter P - Section P.6 - Rational Expressions - Exercise Set - Page 87: 107

Answer

The required solution is $\frac{7x+1}{x}$

Work Step by Step

We have the given expression $\frac{1}{x}+7=\frac{1}{x+7}$. The left side of the given expression is $\frac{1}{x}+7$ And we simplify the above expression: $\begin{align} & \frac{1}{x}+7=\frac{1}{x}+7\times \frac{x}{x} \\ & =\frac{1}{x}+\frac{7x}{x} \\ & =\frac{1+7x}{x} \\ & =\frac{7x+1}{x} \end{align}$ So, the right side of the given expression is $\frac{1}{x+7}$ So, $\frac{1}{x}+7\ne \frac{1}{x+7}$. Thus, the correct form of the given equation is $\frac{1}{x}+7=$ $\frac{7x+1}{x}$.
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