Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 10 - Test: 15

Answer

$-x\sqrt {5x}$

Work Step by Step

$\sqrt {125x^{3}}-3\sqrt {20x^{3}}$ =$\sqrt {25\times5\times x^{2}\times x}-3\sqrt {4\times5\times x^{2}\times x}$ =$5x\sqrt {5\times x}-3(2x)\sqrt {5\times x}$ =$5x\sqrt {5x}-6x\sqrt {5x}$ =$(5x-6x)\sqrt {5x}$ =$-x\sqrt {5x}$
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