Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 8 - Polynomials and Factoring - 8-4 Multiplying Special Cases - Practice and Problem-Solving Exercises - Page 496: 34



Work Step by Step

Rewrite each factor as a binomial with terms that are easy to multiply using mental math. Use the product of a sum and a difference rule. $399\times401=(400-1)(400+1)=160,000-1=159,999$
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