Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter R - Review of Basic Concepts - R.5 Rational Expressions - R.5 Exercises - Page 54: 58



Work Step by Step

The expressions are not similar since they have different denominators. Make the expressions similar using their LCD which is $18a^3b^2$ to obtain: $=\dfrac{7}{18a^3b^2} - \dfrac{2\color{red}{(2a^2b)}}{9ab\color{red}{(2a^2b)}} \\=\dfrac{7}{18a^3b^2}-\dfrac{4a^2b}{18a^3b^2} \\=\color{blue}{\dfrac{7-4a^2b}{18a^3b^2}}$
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