Answer
y axis
Work Step by Step
If a function is an even function then $f(x)=f(-x)$. This means all values on the right hand side of the y axis map exactly to the values of the left. Therefore the function will have y-axis symmetry.
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 2.6 - Transformations of Functions - 2.6 Exercises - Page 206: 5
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