Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 1 - Foundations for Algebra - 1-5 Adding and Subtracting Real Numbers - Practice and Problem-Solving Exercises - Page 34: 47



Work Step by Step

The error is in the final step, which is the addition of a positive number and a negative number: $-4+5$ To add numbers with opposite signs, you find the difference of their absolute values and assign the sum the sign of the addend with the largest absolute value. $|5|\overset?\gt|-4|$ $5\gt4$ Subtract 4 from 5. Since the positive number, 5, has the largest absolute value, the sum will be positive. $5-4=1$
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