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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-4*(((3/8)*x^1)/4)-16 = 0
x^-4*(((3/8)*x)/4)-16 = 0
3/32*x^-3 = 16 // : 3/32
x^-3 = 512/3
-3 < 0
1/(x^3) = 512/3 // * x^3
1 = 512/3*x^3 // : 512/3
3/512 = x^3
x^3 = 3/512 // ^ 1/3
x = (3/512)^(1/3)
x = (3/512)^(1/3)
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