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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x-6 = 2*x // - 2*x
5/x-(2*x)-6 = 0
5/x-2*x-6 = 0
5*x^-1-2*x^1-6*x^0 = 0
(5*x^0-2*x^2-6*x^1)/(x^1) = 0 // * x^2
x^1*(5*x^0-2*x^2-6*x^1) = 0
x^1
5-2*x^2-6*x = 0
5-2*x^2-6*x = 0
DELTA = (-6)^2-(-2*4*5)
DELTA = 76
DELTA > 0
x = (76^(1/2)+6)/(-2*2) or x = (6-76^(1/2))/(-2*2)
x = (2*19^(1/2)+6)/(-4) or x = (6-2*19^(1/2))/(-4)
x in { (2*19^(1/2)+6)/(-4), (6-2*19^(1/2))/(-4)}
x in { (2*19^(1/2)+6)/(-4), (6-2*19^(1/2))/(-4) }
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