Answer
$y$-axis symmetry
Work Step by Step
If $f$ is an even function, then it must have $y$-axis symmetry, since $f(-x)=f(x)$. In other words, the graph looks the same on the left and right sides of the $y$-axis.
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 2, Functions - Section 2.6 - Transformations of Functions - 2.6 Exercises - Page 242: 5
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