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: 25



Work Step by Step

Make the fractions similar using their LCD, which is $20$. to obtain: $=\dfrac{-1(5)}{4(5)}+\dfrac{1(-4)}{-5(-4)} \\=\dfrac{-5}{20} + \dfrac{-4}{20} \\=\dfrac{-5+(-4)}{20} \\=\dfrac{-9}{20} \\=-\dfrac{9}{20}$
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