Answer
$-20\sqrt{y}$
Work Step by Step
RECALL:
For any real numbers $a, b,$ and $c$,
$ac-bc=(a-b)c$
Use the rule above to combine like terms:
$=(8-28)\sqrt{y}
\\=-20\sqrt{y}$
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: 10
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