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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-(2/8) = x/8 // - x/8
6/x-(x/8)-(2/8) = 0
6/x-(x/8)-1/4 = 0
6*x^-1-1/8*x^1-1/4*x^0 = 0
(6*x^0-1/8*x^2-1/4*x^1)/(x^1) = 0 // * x^2
x^1*(6*x^0-1/8*x^2-1/4*x^1) = 0
x^1
(-1/8)*x^2+(-1/4)*x+6 = 0
(-1/8)*x^2+(-1/4)*x+6 = 0
DELTA = (-1/4)^2-(4*6*(-1/8))
DELTA = 49/16
DELTA > 0
x = ((49/16)^(1/2)-(-1/4))/(2*(-1/8)) or x = (-(-1/4)-(49/16)^(1/2))/(2*(-1/8))
x = -8 or x = 6
x in { -8, 6}
x in { -8, 6 }
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