Answer
$(5a-4b)^{2}$
is a perfect square trinomial.
Work Step by Step
25$a^{2}$ -40ab+16$b^{2}$=$(5a)^{2}$ -2(5a)(4b)+$(4b)^{2}$=
$(5a-4b)^{2}$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 6 - Section 6.5 - Factoring by Special Products - Exercise Set - Page 447: 7
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