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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x-(6/x)-1 = 0
3*x-6*x^-1-1 = 0
3*x^1-6*x^-1-1*x^0 = 0
(3*x^2-1*x^1-6*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^2-1*x^1-6*x^0) = 0
x^1
3*x^2-x-6 = 0
3*x^2-x-6 = 0
DELTA = (-1)^2-(-6*3*4)
DELTA = 73
DELTA > 0
x = (73^(1/2)+1)/(2*3) or x = (1-73^(1/2))/(2*3)
x = (73^(1/2)+1)/6 or x = (1-73^(1/2))/6
x in { (1-73^(1/2))/6, (73^(1/2)+1)/6}
x in { (1-73^(1/2))/6, (73^(1/2)+1)/6 }
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