Intermediate Algebra (12th Edition)

Published by Pearson

Chapter R - Section R.1 - Basic Concepts - R.1 Exercises - Page 10: 39

12, 12

Work Step by Step

The additive inverse of a number $a$ is $-a$. Therefore, the additive inverse of -12 is $-(-12)=12$. The absolute value of a number $a$ is equal to $a$ if $a\geq0$ and is equal to $-a$ if $a\lt0$. Therefore, $|-12|=-(-12)=12$. Recall that $-(-a)=a$.

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