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D( x )
x-8 = 0
x-8 = 0
x-8 = 0
x-8 = 0 // + 8
x = 8
x in (-oo:8) U (8:+oo)
(3*x^2-(4*x)-8)/(x-8) = 0
(3*x^2-4*x-8)/(x-8) = 0
3*x^2-4*x-8 = 0
3*x^2-4*x-8 = 0
DELTA = (-4)^2-(-8*3*4)
DELTA = 112
DELTA > 0
x = (112^(1/2)+4)/(2*3) or x = (4-112^(1/2))/(2*3)
x = (4*7^(1/2)+4)/6 or x = (4-4*7^(1/2))/6
(x-((4-4*7^(1/2))/6))*(x-((4*7^(1/2)+4)/6)) = 0
((x-((4-4*7^(1/2))/6))*(x-((4*7^(1/2)+4)/6)))/(x-8) = 0
( x-((4*7^(1/2)+4)/6) )
x-((4*7^(1/2)+4)/6) = 0 // + (4*7^(1/2)+4)/6
x = (4*7^(1/2)+4)/6
( x-((4-4*7^(1/2))/6) )
x-((4-4*7^(1/2))/6) = 0 // + (4-4*7^(1/2))/6
x = (4-4*7^(1/2))/6
x in { (4*7^(1/2)+4)/6, (4-4*7^(1/2))/6 }
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