Answer
The answer is $-6$.
Work Step by Step
We can simplify the expression as follows:
$=(2+\sqrt10)(2-\sqrt10)$
$=2^{2}-\sqrt10^{2}$
(Since $a^{2}-b^{2}=(a+b)(a-b)$)
$=4-10$
$=-6$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 10 - Radical Expressions and Equations - 10-3 Operations With Radical Expressions - Practice and Problem-Solving Exercises - Page 629: 27
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