Answer
$b^{-21}$
Work Step by Step
We start with the given expression: $(b^{-7})^3$
To raise a power to a power, we multiply the exponents: $b^{-7\times3}=b^{-21}$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 7 - Exponents and Exponential Functions - 7-4 More Multiplication Properties of Exponents - Lesson Check - Page 436: 2
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