Answer
$25x^2-4$
Work Step by Step
Using the equation $(a+b)(a-b)=a^{2}-b^{2}$, the expression, (5x-2)(5x+2),
is equivalent to
\begin{array}{l}\require{cancel}
(5x)^2-(2)^2
\\\\=
25x^2-4
.\end{array}
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 5 - Exponents and Polynomials - 5.3 - Multiplying Polynomials - Problem Set 5.3 - Page 208: 85
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