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D( x )
125*x^3 < 0
125*x^3 < 0
125*x^3 < 0
125*x^3 < 0
125*x^3 < 0 // : 125
x^3 < 0/125
x^3 < 0
x^3 < 0 // ^ 1/3
x < 0
x in (-oo:0)
x in <0:+oo)
(125*x^3)^(1/12) = 0
125^(1/12)*x^(1/4) = 0 // : 125^(1/12)
x^(1/4) = 0
x = 0
x = 0
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