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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/9 = x-(2/x)+5 // - x-(2/x)+5
2/x-x+4/9-5 = 0
2*x^-1-1*x^1-41/9*x^0 = 0
(2*x^0-1*x^2-41/9*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-1*x^2-41/9*x^1) = 0
x^1
(-41/9)*x-x^2+2 = 0
(-41/9)*x-x^2+2 = 0
DELTA = (-41/9)^2-(-1*2*4)
DELTA = 2329/81
DELTA > 0
x = ((2329/81)^(1/2)-(-41/9))/(-1*2) or x = (-(-41/9)-(2329/81)^(1/2))/(-1*2)
x = ((2329/81)^(1/2)+41/9)/(-2) or x = (41/9-(2329/81)^(1/2))/(-2)
x in { ((2329/81)^(1/2)+41/9)/(-2), (41/9-(2329/81)^(1/2))/(-2)}
x in { ((2329/81)^(1/2)+41/9)/(-2), (41/9-(2329/81)^(1/2))/(-2) }
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