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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6*x-(5/x)-8 = 0
6*x-5*x^-1-8 = 0
6*x^1-5*x^-1-8*x^0 = 0
(6*x^2-8*x^1-5*x^0)/(x^1) = 0 // * x^2
x^1*(6*x^2-8*x^1-5*x^0) = 0
x^1
6*x^2-8*x-5 = 0
6*x^2-8*x-5 = 0
DELTA = (-8)^2-(-5*4*6)
DELTA = 184
DELTA > 0
x = (184^(1/2)+8)/(2*6) or x = (8-184^(1/2))/(2*6)
x = (2*46^(1/2)+8)/12 or x = (8-2*46^(1/2))/12
x in { (8-2*46^(1/2))/12, (2*46^(1/2)+8)/12}
x in { (8-2*46^(1/2))/12, (2*46^(1/2)+8)/12 }
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