Answer
9$x^{2}$-42xy+49$y^{2}$
Work Step by Step
$(3x-7y)^{2}$=(3x-7y)(3x-7y)=
3x(3x)+3x(-7y)+(-7y)(3x)+(-7y)(-7y)=
9$x^{2}$-21xy-21xy+49$y^{2}$=
9$x^{2}$-42xy+49$y^{2}$
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 - Cumulative Review - Page 480: 36
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