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D( x )
x+3 = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:+oo)
(x^2-(9*x)+5)/(x+3) = 0
(x^2-9*x+5)/(x+3) = 0
x^2-9*x+5 = 0
x^2-9*x+5 = 0
DELTA = (-9)^2-(1*4*5)
DELTA = 61
DELTA > 0
x = (61^(1/2)+9)/(1*2) or x = (9-61^(1/2))/(1*2)
x = (61^(1/2)+9)/2 or x = (9-61^(1/2))/2
(x-((9-61^(1/2))/2))*(x-((61^(1/2)+9)/2)) = 0
((x-((9-61^(1/2))/2))*(x-((61^(1/2)+9)/2)))/(x+3) = 0
( x-((61^(1/2)+9)/2) )
x-((61^(1/2)+9)/2) = 0 // + (61^(1/2)+9)/2
x = (61^(1/2)+9)/2
( x-((9-61^(1/2))/2) )
x-((9-61^(1/2))/2) = 0 // + (9-61^(1/2))/2
x = (9-61^(1/2))/2
x in { (61^(1/2)+9)/2, (9-61^(1/2))/2 }
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