Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 2 - Section 2.4 - Signed Fractions - Exercises - Page 118: 9



Work Step by Step

Make the fractions similar using their LCD, which is $20$: $\\=-\dfrac{1(5)}{4(5)}-\left(-\dfrac{1(4)}{5(4)}\right) \\=-\dfrac{5}{20}-\left(-\dfrac{4}{20}\right) \\=-\dfrac{5}{20}+\dfrac{4}{20} \\=\dfrac{-5+4}{20} \\=-\dfrac{1}{20}$
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