Answer
$-20x^{10n}$
Work Step by Step
Using the law $a^{m}\times a^{n}=a^{m+n}$ to obtain:
$(4x^{3n})(-5x^{7n})$
$=(4\times -5)(x^{3n}\times x^{7n})$
$=(-20)(x^{3n+7n})$
$=-20x^{10n}$
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 5 - Exponents and Polynomials - 5.2 - Multiplying Monomials - Problem Set 5.2 - Page 202: 95
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