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D( x )
x^3 = 0
350/(x^3) < 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
350/(x^3) < 0
350/(x^3) < 0
350*x^-3 < 0
350*x^-3 < 0 // : 350
x^-3 < 0/350
x^-3 < 0
1/(x^3) < 0
x <> 0
1/(x^3) < 0 // * x^6
(x^6)/(x^3) < 0
x^3 < 0
x^3 < 0 // ^ 1/3
x < 0
x in (-oo:0)
x in (0:+oo)
(350/(x^3))^(1/2) = 0
5*14^(1/2)*x^(-3/2) = 0 // : 5*14^(1/2)
x^(-3/2) = 0
x należy do O
x belongs to the empty set
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