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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))-14 = 0
2*x-128*x^-2-14 = 0
2*x^1-128*x^-2-14*x^0 = 0
(2*x^3-14*x^2-128*x^0)/(x^2) = 0 // * x^4
x^2*(2*x^3-14*x^2-128*x^0) = 0
x^2
2*x^3-14*x^2-128 = 0
{ 1, -1, 2, -2, 4, -4, 8, -8, 16, -16, 32, -32, 64, -64, 128, -128 }
1
x = 1
2*x^3-14*x^2-128 = -140
1
-1
x = -1
2*x^3-14*x^2-128 = -144
-1
2
x = 2
2*x^3-14*x^2-128 = -168
2
-2
x = -2
2*x^3-14*x^2-128 = -200
-2
4
x = 4
2*x^3-14*x^2-128 = -224
4
-4
x = -4
2*x^3-14*x^2-128 = -480
-4
8
x = 8
2*x^3-14*x^2-128 = 0
8
x-8
2*x^2+2*x+16
2*x^3-14*x^2-128
x-8
16*x^2-2*x^3
2*x^2-128
16*x-2*x^2
16*x-128
128-16*x
0
2*x^2+2*x+16 = 0
DELTA = 2^2-(2*4*16)
DELTA = -124
DELTA < 0
x in { 8}
x = 8
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