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