College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter R - Section R.1 - Real Numbers - R.1 Assess Your Understanding - Page 15: 11



Work Step by Step

U means union. A U B means the union of all of the elements in A and B. A={1,3,4,5,9} B={2,4,6,7,8} If we put all of the numbers together we get: 1,3,4,5,9 and 2,4,6,7,8. We don't list any element more than once, so although 4 is in both sets, we only list it once. Now we have: 1,3,4,5,9, and 2,6,7,8. Putting them in order for readability we get {1,2,3,4,5,6,7,8,9}.
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