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

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 1 - Introduction to Algebraic Expressions - 1.6 Subtraction of Real Numbers - 1.6 Exercise Set - Page 49: 35



Work Step by Step

For any real number $a$, we know that $-(-a)=a$. That is, the opposite of the opposite of $a$ is $a$. Therefore, when $x=-\frac{2}{5}$, $-(-x)=-(-(-\frac{2}{5}))=-(\frac{2}{5})=-\frac{2}{5}$.
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