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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(1/x) = 20 // - 20
x-(1/x)-20 = 0
x-x^-1-20 = 0
1*x^1-1*x^-1-20*x^0 = 0
(1*x^2-20*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-20*x^1-1*x^0) = 0
x^1
x^2-20*x-1 = 0
x^2-20*x-1 = 0
DELTA = (-20)^2-(-1*1*4)
DELTA = 404
DELTA > 0
x = (404^(1/2)+20)/(1*2) or x = (20-404^(1/2))/(1*2)
x = (2*101^(1/2)+20)/2 or x = (20-2*101^(1/2))/2
x in { (20-2*101^(1/2))/2, (2*101^(1/2)+20)/2}
x in { (20-2*101^(1/2))/2, (2*101^(1/2)+20)/2 }
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