Answer
$42x^3$
Work Step by Step
$2x\times3x\times7x=(2\times3\times7)(x\times x\times x)=42x^{1+1+1}=42x^3$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 10 - Section 10.2 - Multiplication Properties of Exponents - Exercise Set - Page 710: 9
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