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D( k )
k-1 = 0
k-1 = 0
k-1 = 0
k-1 = 0 // + 1
k = 1
k in (-oo:1) U (1:+oo)
(k^2-(9*k)+3)/(k-1) = 0
(k^2-9*k+3)/(k-1) = 0
k^2-9*k+3 = 0
k^2-9*k+3 = 0
DELTA = (-9)^2-(1*3*4)
DELTA = 69
DELTA > 0
k = (69^(1/2)+9)/(1*2) or k = (9-69^(1/2))/(1*2)
k = (69^(1/2)+9)/2 or k = (9-69^(1/2))/2
(k-((9-69^(1/2))/2))*(k-((69^(1/2)+9)/2)) = 0
((k-((9-69^(1/2))/2))*(k-((69^(1/2)+9)/2)))/(k-1) = 0
( k-((69^(1/2)+9)/2) )
k-((69^(1/2)+9)/2) = 0 // + (69^(1/2)+9)/2
k = (69^(1/2)+9)/2
( k-((9-69^(1/2))/2) )
k-((9-69^(1/2))/2) = 0 // + (9-69^(1/2))/2
k = (9-69^(1/2))/2
k in { (69^(1/2)+9)/2, (9-69^(1/2))/2 }
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