#### Answer

$\dfrac{1}{x^{18}}$

#### Work Step by Step

RECALL:
(i) $a^{-m}=\dfrac{1}{a^{m}}, a\ne0$
(ii) $(a^m)^n=a^{mn}$
Use rule (ii) above to obtain:
$=x^{3(-6)}
\\=x^{-18}$
Use rule (i) above to obtain:
$=\dfrac{1}{x^{18}}$

Published by
Pearson

ISBN 10:
0-13417-894-7

ISBN 13:
978-0-13417-894-3

$\dfrac{1}{x^{18}}$

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