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: 121


$x-(x+4)$ $-4$

Work Step by Step

Since the number is being decreased by the sum of it and four, it would be $x-(x+4)$. The sum is the answer you get when you add numbers, and decreased implies subtraction. This then simplifies into $x-x-4$, which is just $-4$.
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