Answer
Does not make sense.
Work Step by Step
We have
$2\sqrt {20}+4\sqrt {75}=2\sqrt {4\times5}+4\sqrt {25\times3}=4\sqrt {5}+20\sqrt {3}$
and the radicals are not alike; thus the statement does not make sense.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.3 - Radicals and Rational Exponents - Exercise Set - Page 47: 131
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