#### Answer

$8y^{10}$

#### Work Step by Step

$\sqrt (64y^{20})=8y^{10}$, because $(8y^{10})^{2}=8y^{10}\times 8y^{10}=(8\times8)\times(y^{10}\times y^{10})=64y^{20}$

Published by
Pearson

ISBN 10:
0321785045

ISBN 13:
978-0-32178-504-6

$8y^{10}$

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