Answer
$4x^{2}-5$
Work Step by Step
$(2x-\sqrt 5)(2x+\sqrt 5)=(2x)^{2}-(\sqrt 5)^{2}=4x^{2}-5$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 10 - Section 10.5 - Integrated Review - Radicals and Rational Exponents - Page 721: 33
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