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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+5 = x-(4/x) // - x-(4/x)
1/x-x+4/x+5 = 0
5*x^-1-1*x^1+5*x^0 = 0
(5*x^1-1*x^2+5*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^1-1*x^2+5*x^0) = 0
x^1
5*x-x^2+5 = 0
5*x-x^2+5 = 0
DELTA = 5^2-(-1*4*5)
DELTA = 45
DELTA > 0
x = (45^(1/2)-5)/(-1*2) or x = (-45^(1/2)-5)/(-1*2)
x = (3*5^(1/2)-5)/(-2) or x = (-3*5^(1/2)-5)/(-2)
x in { (3*5^(1/2)-5)/(-2), (-3*5^(1/2)-5)/(-2)}
x in { (3*5^(1/2)-5)/(-2), (-3*5^(1/2)-5)/(-2) }
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