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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(8*x)/x-4 = 6*x+8/x-4 // - 6*x+8/x-4
(8*x)/x-(6*x)-(8/x)-4+4 = 0
(8*x)/x-6*x-8*x^-1-4+4 = 0
8*x^0-6*x^1-8*x^-1 = 0
(8*x^1-6*x^2-8*x^0)/(x^1) = 0 // * x^2
x^1*(8*x^1-6*x^2-8*x^0) = 0
x^1
8*x-6*x^2-8 = 0
8*x-6*x^2-8 = 0
DELTA = 8^2-(-8*(-6)*4)
DELTA = -128
DELTA < 0
x in { }
x belongs to the empty set
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