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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = x+1 // - x+1
2/x-x-1 = 0
2*x^-1-1*x^1-1*x^0 = 0
(2*x^0-1*x^2-1*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-1*x^2-1*x^1) = 0
x^1
2-x^2-x = 0
2-x^2-x = 0
DELTA = (-1)^2-(-1*2*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)+1)/(-1*2) or x = (1-9^(1/2))/(-1*2)
x = -2 or x = 1
x in { -2, 1}
x in { -2, 1 }
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