Answer
$a-9$
Work Step by Step
Using $(a+b)(a-b)=a^2-b^2$ or the product of the sum and difference of like terms, the expression $
(\sqrt{a}+3)(\sqrt{a}-3)
$ simplifies to
\begin{array}{l}
(\sqrt{a})^2-(3)^2
\\=
a-9
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 7 - Review - Page 469: 99
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