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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2 = (8000/x)^(1/3) // - (8000/x)^(1/3)
2-(8000/x)^(1/3) = 0
-20*x^(-1/3) = -2 // : -20
x^(-1/3) = 1/10
-1/3 < 0
1/(x^(1/3)) = 1/10 // * x^(1/3)
1 = 1/10*x^(1/3) // : 1/10
10 = x^(1/3)
x^(1/3) = 10 // ^ 3
x = 1000
x = 1000
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