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D( x )
x = 0
x-(4*x^-1) = 0
x = 0
x = 0
x-(4*x^-1) = 0
x-(4*x^-1) = 0
x-4*x^-1 = 0
1*x^1-4*x^-1 = 0
(1*x^2-4*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-4*x^0) = 0
x^1
x^2-4 = 0
x^2-4 = 0
DELTA = 0^2-(-4*1*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)+0)/(1*2) or x = (0-16^(1/2))/(1*2)
x = 2 or x = -2
x in { -2, 2}
x in (-oo:-2) U (-2:0) U (0:2) U (2:+oo)
5/(x-(4*x^-1)) = 0
5/(x-4*x^-1) = 0
x-4*x^-1 = 0
x^-1*(x^2-4) = 0
1*x^2 = 4 // : 1
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x^-1*(x-2)*(x+2) = 0
5/(x^-1*(x-2)*(x+2)) = 0
5 = 0
x belongs to the empty set
x belongs to the empty set
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