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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 2*x // - 2*x
8/x-(2*x) = 0
8/x-2*x = 0
8*x^-1-2*x^1 = 0
(8*x^0-2*x^2)/(x^1) = 0 // * x^2
x^1*(8*x^0-2*x^2) = 0
x^1
8-2*x^2 = 0
8-2*x^2 = 0
DELTA = 0^2-(-2*4*8)
DELTA = 64
DELTA > 0
x = (64^(1/2)+0)/(-2*2) or x = (0-64^(1/2))/(-2*2)
x = -2 or x = 2
x in { -2, 2}
x in { -2, 2 }
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