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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
(2*x^2-(5*x)-1)/(x-4) = 0
(2*x^2-5*x-1)/(x-4) = 0
2*x^2-5*x-1 = 0
2*x^2-5*x-1 = 0
DELTA = (-5)^2-(-1*2*4)
DELTA = 33
DELTA > 0
x = (33^(1/2)+5)/(2*2) or x = (5-33^(1/2))/(2*2)
x = (33^(1/2)+5)/4 or x = (5-33^(1/2))/4
(x-((5-33^(1/2))/4))*(x-((33^(1/2)+5)/4)) = 0
((x-((5-33^(1/2))/4))*(x-((33^(1/2)+5)/4)))/(x-4) = 0
( x-((33^(1/2)+5)/4) )
x-((33^(1/2)+5)/4) = 0 // + (33^(1/2)+5)/4
x = (33^(1/2)+5)/4
( x-((5-33^(1/2))/4) )
x-((5-33^(1/2))/4) = 0 // + (5-33^(1/2))/4
x = (5-33^(1/2))/4
x in { (33^(1/2)+5)/4, (5-33^(1/2))/4 }
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