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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
x+32/(x^2) = 0
x+32*x^-2 = 0
x*(32*x^-3+1) = 0
32*x^-3 = -1 // : 32
x^-3 = -1/32
-3 < 0
1/(x^3) = -1/32 // * x^3
1 = -1/32*x^3 // : -1/32
-32 = x^3
x^3 = -32 // ^ 1/3
x = -2*4^(1/3)
x = 0
x = 0
x in { 0}
x = -2*4^(1/3)
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