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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)
0 = (8*x)/(x^2)+64 // - (8*x)/(x^2)+64
0-((8*x)/(x^2))-64 = 0
-8*x^-1-64 = 0
-8*x^-1 = 64 // : -8
x^-1 = -8
-1 < 0
1/(x^1) = -8 // * x^1
1 = -8*x^1 // : -8
-1/8 = x^1
x = -1/8
x = -1/8
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