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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-1 = x-(1/4) // - x-(1/4)
1/x-x+1/4-1 = 0
1*x^-1-1*x^1-3/4*x^0 = 0
(1*x^0-1*x^2-3/4*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-1*x^2-3/4*x^1) = 0
x^1
(-3/4)*x-x^2+1 = 0
(-3/4)*x-x^2+1 = 0
DELTA = (-3/4)^2-(-1*1*4)
DELTA = 73/16
DELTA > 0
x = ((73/16)^(1/2)-(-3/4))/(-1*2) or x = (-(-3/4)-(73/16)^(1/2))/(-1*2)
x = ((73/16)^(1/2)+3/4)/(-2) or x = (3/4-(73/16)^(1/2))/(-2)
x in { ((73/16)^(1/2)+3/4)/(-2), (3/4-(73/16)^(1/2))/(-2)}
x in { ((73/16)^(1/2)+3/4)/(-2), (3/4-(73/16)^(1/2))/(-2) }
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