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: 32

Answer

See below.

Work Step by Step

1. Let the polynomial be $p(x)=r_nx^n+r_{n-1}x^{n-1}+...+r_1x+r_0$ where $r_n ... r_0$ are rational numbers. 2. Since $p(c)=0$, we have $p(c)=r_nc^n+r_{n-1}c^{n-1}+...+r_1c+r_0=0$ 3. Use a similar procedure as in the previous exercise, we can find integers $m_n... m_0$ such that $m_nc^n+m_{n-1}c^{n-1}+...+m_1c+m_0=0$ 4. Thus, $c$ is a root of a polynomial with integer coefficients.
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