#### 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.

Published by
Brooks Cole

ISBN 10:
1305115546

ISBN 13:
978-1-30511-554-5

$y$-axis symmetry

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