Answer
25$m^{2}$ - 16$n^{2}$
Work Step by Step
( 5m + 4n ) ( 5m - 4n) the sum and difference of the same two terms
$(5m)^{2}$ - $(4n)^{2}$
25$m^{2}$ - 16$n^{2}$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Section 5.6 - Special Products - Exercise Set - Page 388: 56
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