Answer
(a) See graph.
(b) $2$.
(c) $(-\infty,2)$.
Work Step by Step
(a) See graph for $f(x)=2^x-4$.
(b) Based on the graph, we can find zero(s) $x=2$.
(c) For $f(x)\lt0$, we have the solution $(-\infty,2)$.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 4 - Exponential and Logarithmic Functions - Section 4.6 Logarithmic and Exponential Equations - 4.6 Assess Your Understanding - Page 338: 105
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