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: 31



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.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.