Answer
$7\sqrt{7}$
Work Step by Step
RECALL:
For any real numbers $a, b,c$ and $d$,
$ad-bd+cd=(a-b+c)d$
Use the rule above to combine like terms:
$=(4-5+8)\sqrt{7}
\\=(-1+8)\sqrt{7}
\\=7\sqrt{7}$
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 8 - Section 8.3 - Operations with Radicals - Exercise Set - Page 591: 19
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