#### Answer

$70x^{9}$

#### Work Step by Step

Mulyiplying the constants and multiplying the variables, the product of the given expression, $
(-10x^4)(-7x^5)
,$ is
\begin{array}{l}\require{cancel}
-10(-7)x^{4+5}
\\\\=
70x^{9}
.\end{array}

Published by
Pearson

ISBN 10:
0-13417-805-X

ISBN 13:
978-0-13417-805-9

$70x^{9}$

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