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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(4/x)-6 = 0
x-4*x^-1-6 = 0
1*x^1-4*x^-1-6*x^0 = 0
(1*x^2-6*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-6*x^1-4*x^0) = 0
x^1
x^2-6*x-4 = 0
x^2-6*x-4 = 0
DELTA = (-6)^2-(-4*1*4)
DELTA = 52
DELTA > 0
x = (52^(1/2)+6)/(1*2) or x = (6-52^(1/2))/(1*2)
x = (2*13^(1/2)+6)/2 or x = (6-2*13^(1/2))/2
x in { (6-2*13^(1/2))/2, (2*13^(1/2)+6)/2}
x in { (6-2*13^(1/2))/2, (2*13^(1/2)+6)/2 }
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