Answer
$21a^4$
Work Step by Step
Simplify by multiplying the coefficients together. Also, recall that $a^{b}a^{c}=a^{b+c}$. Thus, we obtain:
$=[-7\cdot (-3)](a^3 \cdot a)
\\=21a^{3+1}
\\=21a^4$
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 2 - Real Numbers - 2.4 - Exponents - Problem Set 2.4 - Page 75: 52
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