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D( x )
4*x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
5*x-(2/(4*x))-1 = 0
5*x+(-1/2)*x^-1-1 = 0
5*x^1-1/2*x^-1-1*x^0 = 0
(5*x^2-1*x^1-1/2*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^2-1*x^1-1/2*x^0) = 0
x^1
5*x^2-x-1/2 = 0
5*x^2-x-1/2 = 0
DELTA = (-1)^2-(4*5*(-1/2))
DELTA = 11
DELTA > 0
x = (11^(1/2)+1)/(2*5) or x = (1-11^(1/2))/(2*5)
x = (11^(1/2)+1)/10 or x = (1-11^(1/2))/10
x in { (1-11^(1/2))/10, (11^(1/2)+1)/10}
x in { (1-11^(1/2))/10, (11^(1/2)+1)/10 }
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