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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)
x/8-(1/(x^2)) = 0
x/8-x^-2 = 0
1/8*x^1-1*x^-2 = 0
(1/8*x^3-1*x^0)/(x^2) = 0 // * x^4
x^2*(1/8*x^3-1*x^0) = 0
x^2
(1/8)*x^3-1 = 0
(1/8)*x^3-1 = 0 // * 0
{ 1, -1, 2, -2, 4, -4, 8, -8 }
1
x = 1
x^3-8 = -7
1
-1
x = -1
x^3-8 = -9
-1
2
x = 2
x^3-8 = 0
2
x-2
x^2+2*x+4
x^3-8
x-2
2*x^2-x^3
2*x^2-8
4*x-2*x^2
4*x-8
8-4*x
0
x^2+2*x+4 = 0
DELTA = 2^2-(1*4*4)
DELTA = -12
DELTA < 0
x in { 2}
x = 2
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