Answer
1596
Work Step by Step
We can rewrite the product 42$\times$38 into (40+2)(40-2).
Applying the formula: (a+b)(a-b)=$a^{2}$-$b^{2}$,
we have (40+2)(40-2)= $40^{2}$-$2^{2}$= 1600-4= 1596.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
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: 31
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