Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 9 - Section 9.2 - Exponential Functions - 9.2 Exercises - Page 597: 22

Answer

Graph of $f(x)=\left(\dfrac{1}{5}\right)^x$

Work Step by Step

Substituting values of $x$ in the given function, $ f(x)=\left(\dfrac{1}{5}\right)^x $, results to \begin{array}{c|c|c} \text{If }x=-1: & \text{If }x=0 & \text{If }x=1 \\\\ f(x)=y=\left(\dfrac{1}{5}\right)^x & f(x)=y=\left(\dfrac{1}{5}\right)^x & f(x)=y=\left(\dfrac{1}{5}\right)^x \\ y=\left(\dfrac{1}{5}\right)^{-1} & y=\left(\dfrac{1}{5}\right)^0 & y=\left(\dfrac{1}{5}\right)^1 \\\\ y=5 & y=1 & y=\dfrac{1}{5} .\end{array} Tabulating the results above results to the table below. \begin{array}{c|c} \hline x & y \\\hline -1 & 5 \\\hline 0 & 1 \\\hline 1 & \dfrac{1}{5} \end{array} Connecting the points $ \left(-1,5\right), \left(0,1\right), \text{ and } \left(1,\dfrac{1}{5}\right) $ with a curve gives the graph of $ f(x)=\left(\dfrac{1}{5}\right)^x $.
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