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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = x-1 // - x-1
6/x-x+1 = 0
6*x^-1-1*x^1+1*x^0 = 0
(1*x^1-1*x^2+6*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^1-1*x^2+6*x^0) = 0
x^1
x-x^2+6 = 0
x-x^2+6 = 0
DELTA = 1^2-(-1*4*6)
DELTA = 25
DELTA > 0
x = (25^(1/2)-1)/(-1*2) or x = (-25^(1/2)-1)/(-1*2)
x = -2 or x = 3
x in { -2, 3}
x in { -2, 3 }
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