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3x-2y - (x-y) ... ×(x+y) ...
3x-2y - (x-y) 2x-y ×(x+y) 2x²+xy-y²
3x-2y-(x-y) = 3x-2y-x+y = 2x-y
(2x-y) × (x+y) = 2x²+2xy-xy-y² = 2x²+xy-y²
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3x-2y - (x-y) 2x-y ×(x+y) 2x²+xy-y²
3x-2y-(x-y) = 3x-2y-x+y = 2x-y
(2x-y) × (x+y) = 2x²+2xy-xy-y² = 2x²+xy-y²