Answer
$x^{20}$
Work Step by Step
Using the product property for exponents (which states that $a^{m}\times a^{n}=a^{m+n}$, we can conclude that $x^{9}\times x^{11}=x^{20}$
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 - Integrated Review - Operations on Polynomials - Page 712: 13
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