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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(2/x) = 12/240 // - 12/240
x-(2/x)-(12/240) = 0
x-2*x^-1-1/20 = 0
1*x^1-2*x^-1-1/20*x^0 = 0
(1*x^2-1/20*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-1/20*x^1-2*x^0) = 0
x^1
x^2+(-1/20)*x-2 = 0
x^2+(-1/20)*x-2 = 0
DELTA = (-1/20)^2-(-2*1*4)
DELTA = 3201/400
DELTA > 0
x = ((3201/400)^(1/2)-(-1/20))/(1*2) or x = (-(-1/20)-(3201/400)^(1/2))/(1*2)
x = ((3201/400)^(1/2)+1/20)/2 or x = (1/20-(3201/400)^(1/2))/2
x in { (1/20-(3201/400)^(1/2))/2, ((3201/400)^(1/2)+1/20)/2}
x in { (1/20-(3201/400)^(1/2))/2, ((3201/400)^(1/2)+1/20)/2 }
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