Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 8 - Polynomials and Factoring - 8-4 Multiplying Soecial Cases - Practice and Problem-Solving Exercises - Page 508: 34



Work Step by Step

$399\cdot 401=$ ...write as a product of a sum and a difference. $=(400+1)(400-1)$ ...use $(a+b)(a-b)=a^{2}-b^{2}$. $=400^{2}-1^{2}$ ...simplify powers. $=160,000-1$ ...simplify. $=159,999$
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