Given that, 2(x+y)2-3(x+y)-2
Suppose, x+y=a
∴ 2a2-3a-2 =2a2-4a+a-2 =2a(a-2)+1(a-2) =(a-2)(2a-1) =(x+y-2){(2(x+y)+1} =(x+y-2)(2x+2y+1)
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