Answer
See below.
Work Step by Step
Use Theorem 4.2.1, results from previous exercises, and Theorem 4.2.2,
we have:
1. $-2,3,4,r$ are rational numbers,
2. $r^2, -2r, 3r^2$ are rational numbers,
3. Thus $3r^2-2r+4$ is a rational number.
Discrete Mathematics with Applications 4th Edition
by Epp, Susanna S.
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: 25
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