Answer
$(7-2y)(7+2y)$
Work Step by Step
Use the Difference of Two Squares to solve.
$49-4y^{2}=(7)^{2}-(2y)^{2}=(7-2y)(7+2y)$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 1 - Section 1.3 - Algebraic Expressions - 1.3 Exercises - Page 34: 105
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