Answer
$(7+2z)(7-2z)$
Work Step by Step
Since $a^{2}-b^{2}=(a+b)(a-b)$, $49-4z^{2}=(7+2z)(7-2z)$
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 - Section P.6 - Factoring - P.6 Exercises - Page 42: 25
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