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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 = 128/(x^2) // - 128/(x^2)
2*x-(128/(x^2)) = 0
2*x-128*x^-2 = 0
2*x^1-128*x^-2 = 0
(2*x^3-128*x^0)/(x^2) = 0 // * x^4
x^2*(2*x^3-128*x^0) = 0
x^2
2*x^3-128 = 0
{ 1, -1, 2, -2, 4, -4, 8, -8, 16, -16, 32, -32, 64, -64, 128, -128 }
1
x = 1
2*x^3-128 = -126
1
-1
x = -1
2*x^3-128 = -130
-1
2
x = 2
2*x^3-128 = -112
2
-2
x = -2
2*x^3-128 = -144
-2
4
x = 4
2*x^3-128 = 0
4
x-4
2*x^2+8*x+32
2*x^3-128
x-4
8*x^2-2*x^3
8*x^2-128
32*x-8*x^2
32*x-128
128-32*x
0
2*x^2+8*x+32 = 0
DELTA = 8^2-(2*4*32)
DELTA = -192
DELTA < 0
x in { 4}
x = 4
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