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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)
2*x-(54/(x^2)) = 0
2*x-54*x^-2 = 0
2*x^1-54*x^-2 = 0
(2*x^3-54*x^0)/(x^2) = 0 // * x^4
x^2*(2*x^3-54*x^0) = 0
x^2
2*x^3-54 = 0
{ 1, -1, 2, -2, 3, -3, 6, -6, 9, -9, 18, -18, 27, -27, 54, -54 }
1
x = 1
2*x^3-54 = -52
1
-1
x = -1
2*x^3-54 = -56
-1
2
x = 2
2*x^3-54 = -38
2
-2
x = -2
2*x^3-54 = -70
-2
3
x = 3
2*x^3-54 = 0
3
x-3
2*x^2+6*x+18
2*x^3-54
x-3
6*x^2-2*x^3
6*x^2-54
18*x-6*x^2
18*x-54
54-18*x
0
2*x^2+6*x+18 = 0
DELTA = 6^2-(2*4*18)
DELTA = -108
DELTA < 0
x in { 3}
x = 3
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