Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter P - Section P.1 - Algebraic Expressions, Mathematical Models, and Real Numbers - Exercise Set - Page 18: 122


$x-(8-x)$ $2x-8$

Work Step by Step

$x$ is being decreased (implying subtraction) by the difference between $8$ and $x$, which would be $(8-x)$. Therefore you get $x-(8-x)$, which equals $x-8+x$, which equals $2x-8$
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