Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 10 - Exponents and Radicals - 10.8 The Complex Numbers - 10.8 Exercise Set - Page 687: 98


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Work Step by Step

We know: $$(a+b)(a-b)=a^2-b^2$$ Thus, in both cases, we are using the fact that we can cancel out the $ab$ component above (which varies based on the situation) in order to simplify the expression.
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