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 - 1.2 - Prime and Composite Numbers - Problem Set 1.2 - Page 13: 49



Work Step by Step

Since the sum of the digits of $129$ is $12$, which is a multiple of $3$, this number is divisible by $3$. When we divide $129$ by $3$, we get $43$. Since $3$ and $43$ are both prime numbers, the prime factorization of $129$ is $43\times3$
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