Answer
$4a^{2}+4a-3$
Work Step by Step
Substitute $2a$ for $x$ in the expression defining $f$:
$f(2a)=(2a)^{2}+2(2a)-3$
$=2^{2}a^{2}+4a-3$
$=4a^{2}+4a-3$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 7 - Functions and Graphs - Review Exercises: Chapter 7 - Page 495: 13
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