Decomposition factor: (3x-2y) ^ 2 - (3x + 2Y) ^ 2
(3x-2y)^2-(3x+2y)^2
=[(3x-2y)+(3x+2y)][(3x-2y)-(3x+2y)]
=(3x-2y+3x+2y)(3x-2y-3x-2y)
=(6x)*(-4y)
=-24xy
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