Precalculus: Mathematics for Calculus, 7th Edition

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

Chapter 4 - Section 4.5 - Exponential and Logarithmic Functions - 4.5 Exercises - Page 368: 45

Answer

$x=\pm1$

Work Step by Step

$x^{2}2^{x}-2^{x}=0$ Take out common factor $2^{x}$: $2^{x}(x^{2}-1)=0$ Set both factor equal to $0$ and solve each individual equation: $2^{x}=0$ Since no value of $x$ makes this first equation true, it has no solution. Let's move on to the next one: $x^{2}-1=0$ Take the $-1$ to the right side of the equation: $x^{2}=1$ Take the square root of both sides: $\sqrt{x^{2}}=\sqrt{1}$ $x=\pm1$
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