Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.5 - Use of Properties - Problem Set 1.5 - Page 34: 84



Work Step by Step

The initial expression being multiplied is multiplied by 7, so it is a multiple of 7. When 7 is added to this number, it must still be a multiple of 7. Thus, it has a factor other than one, making it a composite number.
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