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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5 = 4*x-(3/x)-1 // - 4*x-(3/x)-1
3/x-(4*x)+1+5 = 0
3/x-4*x+1+5 = 0
3*x^-1-4*x^1+6*x^0 = 0
(6*x^1-4*x^2+3*x^0)/(x^1) = 0 // * x^2
x^1*(6*x^1-4*x^2+3*x^0) = 0
x^1
6*x-4*x^2+3 = 0
6*x-4*x^2+3 = 0
DELTA = 6^2-(-4*3*4)
DELTA = 84
DELTA > 0
x = (84^(1/2)-6)/(-4*2) or x = (-84^(1/2)-6)/(-4*2)
x = (2*21^(1/2)-6)/(-8) or x = (-2*21^(1/2)-6)/(-8)
x in { (2*21^(1/2)-6)/(-8), (-2*21^(1/2)-6)/(-8)}
x in { (2*21^(1/2)-6)/(-8), (-2*21^(1/2)-6)/(-8) }
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