## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson

# Chapter 1 - Introduction to Algebraic Expressions - 1.6 Subtraction of Real Numbers - 1.6 Exercise Set - Page 49: 21

-51

#### Work Step by Step

The opposite of a real number $a$ is $-a$. For any two numbers $a$ and $-a$, $a+(-a)=0$. That is, the sum of a number and its opposite is equal to 0. Therefore, the opposite of 51 is -51, because $51+(-51)=0$.

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