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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
9/(x^2)-(6*x)+9 = (3*x)/(x^2)-(3*x) // - (3*x)/(x^2)-(3*x)
3*x-(6*x)-((3*x)/(x^2))+9/(x^2)+9 = 0
3*x-6*x-3*x^-1+9/(x^2)+9 = 0
9*x^-2-3*x^1-3*x^-1+9*x^0 = 0
(9*x^2-3*x^3-3*x^1+9*x^0)/(x^2) = 0 // * x^4
x^2*(9*x^2-3*x^3-3*x^1+9*x^0) = 0
x^2
9*x^2-3*x^3-3*x+9 = 0
{ 1, -1, 3, -3, 9, -9 }
1
x = 1
9*x^2-3*x^3-3*x+9 = 12
1
-1
x = -1
9*x^2-3*x^3-3*x+9 = 24
-1
3
x = 3
9*x^2-3*x^3-3*x+9 = 0
3
x-3
-3*x^2-3
9*x^2-3*x^3-3*x+9
x-3
3*x^3-9*x^2
9-3*x
3*x-9
0
-3*x^2-3 = 0
DELTA = 0^2-(-3*(-3)*4)
DELTA = -36
DELTA < 0
x in { 3}
x = 3
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