Precalculus (6th Edition) Blitzer

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

Chapter P - Section P.8 - Modeling with Equations - Exercise Set - Page 125: 74

Answer

The solution set of the provided equation $\frac{x+3}{4}=\frac{x-2}{3}+\frac{1}{4}$ is $\left\{ 14 \right\}$.

Work Step by Step

Consider the provided equation is, $\frac{x+3}{4}=\frac{x-2}{3}+\frac{1}{4}$ Take common denominator of the above equation and simplify, Thus, $\begin{align} & \frac{x+3}{4}=\frac{x-2}{3}+\frac{1}{4} \\ & \frac{x+3}{4}=\frac{4\left( x-2 \right)+1\left( 3 \right)}{12} \\ & \frac{x+3}{4}=\frac{4x-8+3}{12} \\ & \frac{x+3}{4}=\frac{4x-5}{12} \end{align}$ Cross multiply and add like terms of the above equation, Thus, $\begin{align} & \frac{x+3}{4}=\frac{4x-5}{12} \\ & 12\left( x+3 \right)=4\left( 4x-5 \right) \\ & 12x+36=16x-20 \\ & 56=4x \end{align}$ Divide both sides of the above equation by $4$ , Thus, $\begin{align} & \frac{4x}{4}=\frac{56}{4} \\ & x=14 \end{align}$ Hence, the solution set of the provided equation $\frac{x+3}{4}=\frac{x-2}{3}+\frac{1}{4}$ is $\left\{ 14 \right\}$.
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