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D( x )
x^3 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
8 = (34^3)/(x^3) // - (34^3)/(x^3)
8-((34^3)/(x^3)) = 0
-39304*x^-3 = -8 // : -39304
x^-3 = 1/4913
-3 < 0
1/(x^3) = 1/4913 // * x^3
1 = 1/4913*x^3 // : 1/4913
4913 = x^3
x^3 = 4913 // ^ 1/3
x = 17
x = 17
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