Answer
$$-144
.$$
Work Step by Step
Since $a=2$ and $b=-3$, we have
$$(9a^2)(-2a)=(9(-2)) (a^3)=-18 (2)^3\\
=-18*8=-144
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 5 - Section 5.4 - Multiplication of Monomials - Exercise - Page 224: 51
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