College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter P, Prerequisites - Chapter P Review - Exercises - Page 77: 69



Work Step by Step

Use the formula $(a-b)(a+b)=a^2-b^2$ with $a=2y$ and $b=7$ to obtain: $=(2y)^2-7^2 \\=4y^2-49$
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