Answer
4$x^{2}$ + 3xy -$y^{2}$
Work Step by Step
( x + y )(4x - y) FOIL method
(x)(4x) + ( x )(-y) + (y)(4x) + (y)(-y)
4$x^{2}$ -xy + 4xy - $y^{2}$
4$x^{2}$ + 3xy -$y^{2}$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Section 5.6 - Special Products - Exercise Set - Page 388: 67
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