Precalculus: Mathematics for Calculus, 7th Edition

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

Chapter 1 - Review - Exercises - Page 136: 141

Answer

The solutions are: $x=-1$ $x=-1.15$ $x \approx -2.724$ $x \approx 2.874$

Work Step by Step

To solve the given equation graphically, do the following steps: (1) Use a graphing utility to graph $y=x^4-9x^2$ (refer to the red graph) and $y=x-9$ (refer to the blue graph); (2) Identify the points where the graphs intersect each other. The x-coordinates of these points are the solutions to the given equation. Thus, the solutions are: $x=-1$ $x=-1.15$ $x \approx -2.724$ $x \approx 2.874$ (refer to the attached image below for the graph)
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