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D( t )
t-5 = 0
t-5 = 0
t-5 = 0
t-5 = 0 // + 5
t = 5
t in (-oo:5) U (5:+oo)
(2*t^2-(8*t)-3)/(t-5) = 0
(2*t^2-8*t-3)/(t-5) = 0
2*t^2-8*t-3 = 0
2*t^2-8*t-3 = 0
DELTA = (-8)^2-(-3*2*4)
DELTA = 88
DELTA > 0
t = (88^(1/2)+8)/(2*2) or t = (8-88^(1/2))/(2*2)
t = (2*22^(1/2)+8)/4 or t = (8-2*22^(1/2))/4
(t-((8-2*22^(1/2))/4))*(t-((2*22^(1/2)+8)/4)) = 0
((t-((8-2*22^(1/2))/4))*(t-((2*22^(1/2)+8)/4)))/(t-5) = 0
( t-((2*22^(1/2)+8)/4) )
t-((2*22^(1/2)+8)/4) = 0 // + (2*22^(1/2)+8)/4
t = (2*22^(1/2)+8)/4
( t-((8-2*22^(1/2))/4) )
t-((8-2*22^(1/2))/4) = 0 // + (8-2*22^(1/2))/4
t = (8-2*22^(1/2))/4
t in { (2*22^(1/2)+8)/4, (8-2*22^(1/2))/4 }
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