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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x^2-(49*x)+36)/x-9 = 0
(5*x^2-49*x+36)/x-9 = 0
(5*x^2-49*x+36)/x+(-9*x)/x = 0
5*x^2-49*x-9*x+36 = 0
5*x^2-58*x+36 = 0
5*x^2-58*x+36 = 0
5*x^2-58*x+36 = 0
DELTA = (-58)^2-(4*5*36)
DELTA = 2644
DELTA > 0
x = (2644^(1/2)+58)/(2*5) or x = (58-2644^(1/2))/(2*5)
x = (2*661^(1/2)+58)/10 or x = (58-2*661^(1/2))/10
(x-((58-2*661^(1/2))/10))*(x-((2*661^(1/2)+58)/10)) = 0
((x-((58-2*661^(1/2))/10))*(x-((2*661^(1/2)+58)/10)))/x = 0
((x-((58-2*661^(1/2))/10))*(x-((2*661^(1/2)+58)/10)))/x = 0 // * x
(x-((58-2*661^(1/2))/10))*(x-((2*661^(1/2)+58)/10)) = 0
( x-((2*661^(1/2)+58)/10) )
x-((2*661^(1/2)+58)/10) = 0 // + (2*661^(1/2)+58)/10
x = (2*661^(1/2)+58)/10
( x-((58-2*661^(1/2))/10) )
x-((58-2*661^(1/2))/10) = 0 // + (58-2*661^(1/2))/10
x = (58-2*661^(1/2))/10
x in { (2*661^(1/2)+58)/10, (58-2*661^(1/2))/10 }
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