Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Appendix A - A Exercises - Page A6: 10



Work Step by Step

The denominator was moved term-by-term to the numerator. The correct procedure: $\frac{1}{a^{-1}+b^{-1}}=\frac{1}{a^{-1}+b^{-1}}\frac{ab}{ab}=\frac{ab}{a+b}$
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