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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6/2)*x+6/x+6/x+6+12 = 1 // - 1
(6/2)*x+6/x+6/x-1+6+12 = 0
3*x^1+12*x^-1+17*x^0 = 0
(3*x^2+17*x^1+12*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^2+17*x^1+12*x^0) = 0
x^1
3*x^2+17*x+12 = 0
3*x^2+17*x+12 = 0
DELTA = 17^2-(3*4*12)
DELTA = 145
DELTA > 0
x = (145^(1/2)-17)/(2*3) or x = (-145^(1/2)-17)/(2*3)
x = (145^(1/2)-17)/6 or x = (-(145^(1/2)+17))/6
x in { (-(145^(1/2)+17))/6, (145^(1/2)-17)/6}
x in { (-(145^(1/2)+17))/6, (145^(1/2)-17)/6 }
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