Answer
159,999
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.
$399\times401=(400-1)(400+1)=160,000-1=159,999$
Algebra 1
by Hall, Prentice
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
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