Precalculus (6th Edition) Blitzer

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

Chapter 2 - Review Exercises - Page 430: 38

Answer

a. rises to the left and also rises to the right. b. neither c. see graph.
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Work Step by Step

a. The leading term of the function $f(x)=3x^4-15x^3$ is $3x^4$, with a coefficient of $+3$ and an even power. Thus, we can identify its end behaviors as $x\to-\infty, y\to\infty$ and $x\to\infty, y\to\infty$. That is, the curve rises to the left and also rises to the right. b. We test: $f(-x)=3(-x)^4-15(-x)^3=3x^4+15x^3$ as $f(-x)\ne f(x)$ and $f(-x)\ne -f(x)$, the function is neither symmetric with respect to the y-axis nor with the origin. c. See graph.
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