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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x = x-(2/16) // - x-(2/16)
12/x-x+2/16 = 0
12*x^-1-1*x^1+1/8*x^0 = 0
(1/8*x^1-1*x^2+12*x^0)/(x^1) = 0 // * x^2
x^1*(1/8*x^1-1*x^2+12*x^0) = 0
x^1
(1/8)*x-x^2+12 = 0
(1/8)*x-x^2+12 = 0
DELTA = (1/8)^2-(-1*4*12)
DELTA = 3073/64
DELTA > 0
x = ((3073/64)^(1/2)-(1/8))/(-1*2) or x = (-(1/8)-(3073/64)^(1/2))/(-1*2)
x = ((3073/64)^(1/2)-1/8)/(-2) or x = ((3073/64)^(1/2)+1/8)/2
x in { ((3073/64)^(1/2)-1/8)/(-2), ((3073/64)^(1/2)+1/8)/2}
x in { ((3073/64)^(1/2)-1/8)/(-2), ((3073/64)^(1/2)+1/8)/2 }
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