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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-2 = 4*x-(1/x)-1 // - 4*x-(1/x)-1
1/x-(4*x)-2+1 = 0
1/x-4*x-2+1 = 0
1*x^-1-4*x^1-1*x^0 = 0
(1*x^0-4*x^2-1*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-4*x^2-1*x^1) = 0
x^1
1-4*x^2-x = 0
1-4*x^2-x = 0
DELTA = (-1)^2-(-4*1*4)
DELTA = 17
DELTA > 0
x = (17^(1/2)+1)/(-4*2) or x = (1-17^(1/2))/(-4*2)
x = (17^(1/2)+1)/(-8) or x = (1-17^(1/2))/(-8)
x in { (17^(1/2)+1)/(-8), (1-17^(1/2))/(-8)}
x in { (17^(1/2)+1)/(-8), (1-17^(1/2))/(-8) }
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