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(x+y) (x+2y) (x-y)
(x+y) (x+2y) (x-y) = (x^2 + 2xy + xy + 2y^2)(x - y); = (x^2 + 3xy + 2y^2)(x - y); = x^3 - x^2y + 3x^2y - 3xy^2 + 2xy^2 - 2y^3; = x^3 + 2x^2y - xy^2 - 2y^3
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Asked 2/13/2011 10:57:59 AM
Updated 6/3/2015 12:18:22 AM
1 Answer/Comment
Flagged by alfred123 [6/3/2015 12:17:48 AM], Edited by Andrew. [6/3/2015 12:18:19 AM], Unflagged by Andrew. [6/3/2015 12:18:22 AM]
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(x+y) (x+2y) (x-y)

= (x^2 + 2xy + xy + 2y^2)(x - y);

= (x^2 + 3xy + 2y^2)(x - y);

= x^3 - x^2y + 3x^2y - 3xy^2 + 2xy^2 - 2y^3;

= x^3 + 2x^2y - xy^2 - 2y^3
Added 6/3/2015 12:17:16 AM
This answer has been confirmed as correct and helpful.
Confirmed by Andrew. [6/3/2015 12:18:29 AM]
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