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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0 = 2*x+3200/x // - 2*x+3200/x
0-(2*x)-(3200/x) = 0
-2*x-3200*x^-1 = 0
-2*x^1-3200*x^-1 = 0
(-2*x^2-3200*x^0)/(x^1) = 0 // * x^2
x^1*(-2*x^2-3200*x^0) = 0
x^1
-2*x^2-3200 = 0
-2*x^2-3200 = 0
DELTA = 0^2-(-3200*(-2)*4)
DELTA = -25600
DELTA < 0
x in { }
x belongs to the empty set
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