Answer
$4x^{15}$
Work Step by Step
RECALL:
(i) $\dfrac{a^m}{a^n} = a^{m-n}. a \ne0$
Divide the coefficients by each other and the variables by each other to obtain:
$=\dfrac{12}{3} \cdot x^{5-(-10)}
\\=4 \cdot x^{5+10}
\\=4x^{15}$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 1 - Section 1.6 - Properties of Integral Exponents - Exercise Set - Page 80: 100
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