已知x-y=2,xy=80,求X² +y²的值

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已知x-y=2,xy=80,求X²+y²的值已知x-y=2,xy=80,求X²+y²的值已知x-y=2,xy=80,求X²+y²的值X

已知x-y=2,xy=80,求X² +y²的值
已知x-y=2,xy=80,求X² +y²的值

已知x-y=2,xy=80,求X² +y²的值
X² +y²=x^2-2xy+y^2+2xy
=(x-y)^2+2xy
=4+2x80
=4+160
=164