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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(1/x)-2 = 1 // - 1
2*x-(1/x)-2-1 = 0
2*x-x^-1-2-1 = 0
2*x^1-1*x^-1-3*x^0 = 0
(2*x^2-3*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-3*x^1-1*x^0) = 0
x^1
2*x^2-3*x-1 = 0
2*x^2-3*x-1 = 0
DELTA = (-3)^2-(-1*2*4)
DELTA = 17
DELTA > 0
x = (17^(1/2)+3)/(2*2) or x = (3-17^(1/2))/(2*2)
x = (17^(1/2)+3)/4 or x = (3-17^(1/2))/4
x in { (3-17^(1/2))/4, (17^(1/2)+3)/4}
x in { (3-17^(1/2))/4, (17^(1/2)+3)/4 }
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