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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-(4*x)-(1/x)+5+5 = 0
3/x-4*x-x^-1+5+5 = 0
2*x^-1-4*x^1+10*x^0 = 0
(10*x^1-4*x^2+2*x^0)/(x^1) = 0 // * x^2
x^1*(10*x^1-4*x^2+2*x^0) = 0
x^1
10*x-4*x^2+2 = 0
10*x-4*x^2+2 = 0
DELTA = 10^2-(-4*2*4)
DELTA = 132
DELTA > 0
x = (132^(1/2)-10)/(-4*2) or x = (-132^(1/2)-10)/(-4*2)
x = (2*33^(1/2)-10)/(-8) or x = (-2*33^(1/2)-10)/(-8)
x in { (2*33^(1/2)-10)/(-8), (-2*33^(1/2)-10)/(-8)}
x in { (2*33^(1/2)-10)/(-8), (-2*33^(1/2)-10)/(-8) }
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