Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 3 - Section 3.2 - Polynomial Functions and Their Graphs - 3.2 Exercises - Page 266: 11

Answer

graph V

Work Step by Step

The end behaviour of R(x) matches the end behavior of the leading term, $-x^{5}$ As $x\rightarrow-\infty,$ $x^{5}$ is a large negative number, $-x^{5} $ is a large positive number, so as $x\rightarrow-\infty,$ R(x)$\rightarrow$+$\infty$ (the graph rises up on the far left) As $ x\rightarrow$+$\infty,$ $x^{5}$ is a large positive number, $-x^{5} $ is a large negative number, so as $x\rightarrow+\infty,$ R(x)$\rightarrow-\infty$ (the graph sinks down on the far right) The graphs that fit this behavior are IV and V. To decide, calculate R(1)=$-1+5-4=0$, so we choose the graph whose x-intercept is 1, graph V
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