Answer
$4-18x^{2}$
Work Step by Step
Substitute $3x$ to $x$ in $f(x)$ to obtain:
$f(3x)= 4-2(3x)^{2}=4-2(9x^{2})=4-18x^{2}$
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 4.1 Composite Functions - 4.1 Assess Your Understanding - Page 279: 2
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