Discrete Mathematics with Applications 4th Edition

Published by Cengage Learning
ISBN 10: 0-49539-132-8
ISBN 13: 978-0-49539-132-6

Chapter 4 - Elementary Number Theory and Methods of Proof - Exercise Set 4.2 - Page 169: 22

Answer

True

Work Step by Step

$a^2+a$ factors as $a(a+1)$. Since $a$ is odd, $a+1$ is even, and since the product of an even integer and an odd one is even, the statement is true.
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