Answer
$-40\ a^7b^4 $
Work Step by Step
By multiplying the numerical coefficients and adding the powers of the variables, we get $$ (-4a^2b)(-5ab^3)(-2a^4)=-40\ a^7b^4 .$$
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 223: 24
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