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x+y = 8
xy = 20
(x+y)²=x²+y²+2xy
8² = x²+y²+2(20)
x²+y² = 64-40
x²+y² = 24
(x-y)²=|x²+y²-2xy|
(x-y)²=|24-2(20)|
(x-y)²=16
x-y=√16
x-y = 4