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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/3 = 8/x-2 // - 8/x-2
x/3-(8/x)+2 = 0
x/3-8*x^-1+2 = 0
1/3*x^1-8*x^-1+2*x^0 = 0
(1/3*x^2+2*x^1-8*x^0)/(x^1) = 0 // * x^2
x^1*(1/3*x^2+2*x^1-8*x^0) = 0
x^1
(1/3)*x^2+2*x-8 = 0
(1/3)*x^2+2*x-8 = 0
DELTA = 2^2-(-8*4*(1/3))
DELTA = 44/3
DELTA > 0
x = ((44/3)^(1/2)-2)/(2*(1/3)) or x = (-(44/3)^(1/2)-2)/(2*(1/3))
x = 3/2*((44/3)^(1/2)-2) or x = -3/2*((44/3)^(1/2)+2)
x in { -3/2*((44/3)^(1/2)+2), 3/2*((44/3)^(1/2)-2)}
x in { -3/2*((44/3)^(1/2)+2), 3/2*((44/3)^(1/2)-2) }
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