if x +y=7 and xy=-22 FIND
(X - Y) AND X^2+Y^2.
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x^2+y^2+2xy=(x+y)^2
x^2+y^2+2(-22)= 49
x^2+y^2-44=49
x^2+y^2=93
x^2+y^2+2(-22)= 49
x^2+y^2-44=49
x^2+y^2=93
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