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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/9 = 2*x-(5/x) // - 2*x-(5/x)
5/x-(2*x)+8/9 = 0
5/x-2*x+8/9 = 0
5*x^-1-2*x^1+8/9*x^0 = 0
(8/9*x^1-2*x^2+5*x^0)/(x^1) = 0 // * x^2
x^1*(8/9*x^1-2*x^2+5*x^0) = 0
x^1
(8/9)*x-2*x^2+5 = 0
(8/9)*x-2*x^2+5 = 0
DELTA = (8/9)^2-(-2*4*5)
DELTA = 3304/81
DELTA > 0
x = ((3304/81)^(1/2)-(8/9))/(-2*2) or x = (-(8/9)-(3304/81)^(1/2))/(-2*2)
x = ((3304/81)^(1/2)-8/9)/(-4) or x = ((3304/81)^(1/2)+8/9)/4
x in { ((3304/81)^(1/2)-8/9)/(-4), ((3304/81)^(1/2)+8/9)/4}
x in { ((3304/81)^(1/2)-8/9)/(-4), ((3304/81)^(1/2)+8/9)/4 }
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