(x+y) (2x+y)+(x+2y)(x-y)
(1.5x-4y) (1.5+4y+3)-4.5x+12y
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1) (x+y) (2x+y)+(x+2y)(x-y) = 2x^2 + xy + 2xy + y^2 + x^2 - xy + 2xy - 2y^2
= 3x^2 + 4xy - y^2.
2) (1.5x-4y) (1.5x+4y+3)-4.5x+12y = 2.25x^2 + 6xy + 4.5x - 6xy - 16y^2 - 12y - 4.5x + 12y
= 2.25x^2 - 16y^2.
Hope this helps!
= 3x^2 + 4xy - y^2.
2) (1.5x-4y) (1.5x+4y+3)-4.5x+12y = 2.25x^2 + 6xy + 4.5x - 6xy - 16y^2 - 12y - 4.5x + 12y
= 2.25x^2 - 16y^2.
Hope this helps!
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