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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X^2-(13*x)+12/x-12 = 0
X^2-13*x+12/x-12 = 0
12*x^-1-13*x^1-12*x^0 = 0
(12*x^0-13*x^2-12*x^1)/(x^1) = 0 // * x^2
x^1*(12*x^0-13*x^2-12*x^1) = 0
x^1
12-13*x^2-12*x = 0
12-13*x^2-12*x = 0
DELTA = (-12)^2-(-13*4*12)
DELTA = 768
DELTA > 0
x = (768^(1/2)+12)/(-13*2) or x = (12-768^(1/2))/(-13*2)
x = (16*3^(1/2)+12)/(-26) or x = (12-16*3^(1/2))/(-26)
x in { (16*3^(1/2)+12)/(-26), (12-16*3^(1/2))/(-26)}
x in { (16*3^(1/2)+12)/(-26), (12-16*3^(1/2))/(-26) }
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