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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(1/x)+1 = 5/4 // - 5/4
2*x-(1/x)-(5/4)+1 = 0
2*x-x^-1-5/4+1 = 0
2*x^1-1*x^-1-1/4*x^0 = 0
(2*x^2-1/4*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-1/4*x^1-1*x^0) = 0
x^1
2*x^2+(-1/4)*x-1 = 0
2*x^2+(-1/4)*x-1 = 0
DELTA = (-1/4)^2-(-1*2*4)
DELTA = 129/16
DELTA > 0
x = ((129/16)^(1/2)-(-1/4))/(2*2) or x = (-(-1/4)-(129/16)^(1/2))/(2*2)
x = ((129/16)^(1/2)+1/4)/4 or x = (1/4-(129/16)^(1/2))/4
x in { (1/4-(129/16)^(1/2))/4, ((129/16)^(1/2)+1/4)/4}
x in { (1/4-(129/16)^(1/2))/4, ((129/16)^(1/2)+1/4)/4 }
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