Factorise: 4(x - y)2 - 12(x - y) (x + y) + 9(x + y)
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Answer:
4x-4y-10(x-y)(x+y)+9x+9y
4x-4y-10x+10y+x+y+9x+9y
-6x+6y+x+y+9x+9y
-5x+7y+9x+9y
4x+16y
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