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y=8√8=16√2
W(x,y)=(4²+2*4*16√2+2*(16√2)²)(4²-2*4*16√2+2*(16√2)²)=(16+128√2+1024)(16-128√2+1024)=(1040+128√2)(1040-128√2) = 1081600-32768=1048832