Answer
$$f(2x) = 6x-1$$
$$2f(x) = 6x-2$$
Work Step by Step
For x = 2x
$f(2x) = 3(2x) - 1$ ... multiply
$=6x - 1$
________________
$f(x) = 3x - 1$
therefore
$2f(x) = 2(3x-1)$ ... multiply
$=6x - 2$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 2 - Section 2.1 - Functions - Exercises - Page 157: 36
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