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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-5 = 6*x // - 6*x
2/x-(6*x)-5 = 0
2/x-6*x-5 = 0
2*x^-1-6*x^1-5*x^0 = 0
(2*x^0-6*x^2-5*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-6*x^2-5*x^1) = 0
x^1
2-6*x^2-5*x = 0
2-6*x^2-5*x = 0
DELTA = (-5)^2-(-6*2*4)
DELTA = 73
DELTA > 0
x = (73^(1/2)+5)/(-6*2) or x = (5-73^(1/2))/(-6*2)
x = (73^(1/2)+5)/(-12) or x = (5-73^(1/2))/(-12)
x in { (73^(1/2)+5)/(-12), (5-73^(1/2))/(-12)}
x in { (73^(1/2)+5)/(-12), (5-73^(1/2))/(-12) }
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