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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+4/x = 5 // - 5
x+4/x-5 = 0
1*x^1+4*x^-1-5*x^0 = 0
(1*x^2-5*x^1+4*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-5*x^1+4*x^0) = 0
x^1
x^2-5*x+4 = 0
x^2-5*x+4 = 0
DELTA = (-5)^2-(1*4*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)+5)/(1*2) or x = (5-9^(1/2))/(1*2)
x = 4 or x = 1
x in { 1, 4}
x in { 1, 4 }
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