Answer
$-4x\sqrt {2y}$
Work Step by Step
$3x\sqrt {2y}-7x\sqrt {2y}=\sqrt {2y}\times(3x-7x)=\sqrt {2y}\times(-4x)=-4x\sqrt {2y}$
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Chapter 8 - Radical Functions - 8.2 Simplifying, Adding, and Subtracting Radicals - 8.2 Exercises - Page 634: 50
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