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 -$y^{2}$
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