Answer
$\{1,2,5,a\}$
Work Step by Step
The union includes all the values of both sets, but any doubles are only counted once.
$\{1,2,5\}$ union $\{5,a\}$
$\{1,2,5,a\}$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter P - Summary, Review, and Test - Test - Page 91: 4
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