Functions Modeling Change: A Preparation for Calculus, 5th Edition

Published by Wiley
ISBN 10: 1118583191
ISBN 13: 978-1-11858-319-7

Chapter 4 - Exponential Functions - Exercises to Skills for Chapter 4 - Page 185: 65



Work Step by Step

Solving the equation for $x$, we find: $$ 7x^4-20x^2=0 \\ x^2\left(\sqrt{7}x+2\sqrt{5}\right)\left(\sqrt{7}x-2\sqrt{5}\right)=0 \\ x=0,\:x=-\frac{2\sqrt{35}}{7},\:x=\frac{2\sqrt{35}}{7}$$
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