Answer
$-45a^{4}$
Work Step by Step
$15a^{3} \times -3a^{1}$
$=(15 \times -3)(a^{3} \times a^{1})$
$= -45(a^{3} \times a^{1})$
$= -45(a^{3 + 1}) $
$= -45a^{4}$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 7 - Exponents and Exponential Functions - 7-3 More Multiplication Properties of Exponents - Practice and Problem-Solving Exercises - Page 437: 22
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