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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/9 = 2/x // - 2/x
(2*x)/9-(2/x) = 0
(2*x)/9-2*x^-1 = 0
2/9*x^1-2*x^-1 = 0
(2/9*x^2-2*x^0)/(x^1) = 0 // * x^2
x^1*(2/9*x^2-2*x^0) = 0
x^1
(2/9)*x^2-2 = 0
(2/9)*x^2-2 = 0
DELTA = 0^2-(-2*4*(2/9))
DELTA = 16/9
DELTA > 0
x = ((16/9)^(1/2)+0)/(2*(2/9)) or x = (0-(16/9)^(1/2))/(2*(2/9))
x = 3 or x = -3
x in { -3, 3}
x in { -3, 3 }
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