Precalculus (6th Edition) Blitzer

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

Chapter 3 - Review Exercises - Page 512: 38

Answer

See the graph below:

Work Step by Step

Let us draw the curve of $ f\left( x \right)={{\log }_{2}}x $ as follows: Construct the table of coordinates for $ f\left( x \right)={{\log }_{2}}x $ Choose the appropriate values for $ x $ and calculate the corresponding $ y\text{-values}$: Now, plot every point given in the above table in the graph and join them using a smooth curve, and the $ y\text{-axis}$ or $ x=0$ as the vertical asymptote. Now, the curve of $ r\left( x \right)={{\log }_{2}}\left( -x \right)$ is the same as the graph of $ f\left( x \right)={{\log }_{2}}x $ reflected about the $ y\text{-axis}$ (by multiply each $ x\text{-coordinate}$ by −1). As observed in the graph, the vertical asymptote is $ x=0$. Observe the graph of $ r\left( x \right)={{\log }_{2}}\left( -x \right)$: the $ x\text{-intercept}$ of the function $ r\left( x \right)={{\log }_{2}}\left( -x \right)$ is $\left( -1,0 \right)$, the vertical asymptote is $ x=0$, and the domain of the provided function is $\left( -\infty,0 \right)$, and the range is $\left( -\infty,\infty \right)$. Thus, the $ x\text{-intercept}$ of the function $ r\left( x \right)={{\log }_{2}}\left( -x \right)$ is $\left( -1,0 \right)$, the vertical asymptote is $ x=0$, and the domain of the provided function is $\left( -\infty,0 \right)$, and range is $\left( -\infty,\infty \right)$.
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