Answer
$4y^2-49$
Work Step by Step
Use the formula $(a-b)(a+b)=a^2-b^2$ with $a=2y$ and $b=7$ to obtain:
$=(2y)^2-7^2
\\=4y^2-49$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter P, Prerequisites - Chapter P Review - Exercises - Page 77: 69
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