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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(x^2-(5*x)-9)/(x-2) = 0
(x^2-5*x-9)/(x-2) = 0
x^2-5*x-9 = 0
x^2-5*x-9 = 0
DELTA = (-5)^2-(-9*1*4)
DELTA = 61
DELTA > 0
x = (61^(1/2)+5)/(1*2) or x = (5-61^(1/2))/(1*2)
x = (61^(1/2)+5)/2 or x = (5-61^(1/2))/2
(x-((5-61^(1/2))/2))*(x-((61^(1/2)+5)/2)) = 0
((x-((5-61^(1/2))/2))*(x-((61^(1/2)+5)/2)))/(x-2) = 0
( x-((5-61^(1/2))/2) )
x-((5-61^(1/2))/2) = 0 // + (5-61^(1/2))/2
x = (5-61^(1/2))/2
( x-((61^(1/2)+5)/2) )
x-((61^(1/2)+5)/2) = 0 // + (61^(1/2)+5)/2
x = (61^(1/2)+5)/2
x in { (5-61^(1/2))/2, (61^(1/2)+5)/2 }
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