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