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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/9 = x-(17/x) // - x-(17/x)
17/x-x+2/9 = 0
17*x^-1-1*x^1+2/9*x^0 = 0
(2/9*x^1-1*x^2+17*x^0)/(x^1) = 0 // * x^2
x^1*(2/9*x^1-1*x^2+17*x^0) = 0
x^1
(2/9)*x-x^2+17 = 0
(2/9)*x-x^2+17 = 0
DELTA = (2/9)^2-(-1*4*17)
DELTA = 5512/81
DELTA > 0
x = ((5512/81)^(1/2)-(2/9))/(-1*2) or x = (-(2/9)-(5512/81)^(1/2))/(-1*2)
x = ((5512/81)^(1/2)-2/9)/(-2) or x = ((5512/81)^(1/2)+2/9)/2
x in { ((5512/81)^(1/2)-2/9)/(-2), ((5512/81)^(1/2)+2/9)/2}
x in { ((5512/81)^(1/2)-2/9)/(-2), ((5512/81)^(1/2)+2/9)/2 }
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