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: 2



Work Step by Step

Make the fractions similar using their LCD, which is $21$: $=-\dfrac{2(7)}{3(7)}+\left(-\dfrac{2(3)}{7(3)}\right) \\=-\dfrac{14}{21}+\left(-\dfrac{6}{21}\right) \\=\dfrac{-14-6}{21} \\=-\dfrac{20}{21}$
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