Answer
$ 72m^{11}$
Work Step by Step
We used: $a^n a^m = a^{n+m}$
$-3m^4 \times 6m^2 \times -4m^5 = -3 \times 6 \times -4 = m^{4+2+5} = 72m^{11}$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter R - Review of Basic Concepts - R.3 Polynomials - R.3 Exercises - Page 32: 17
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