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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
t-(8/t) = 17/t // - 17/t
t-(8/t)-(17/t) = 0
t-8*t^-1-17*t^-1 = 0
1*t^1-25*t^-1 = 0
(1*t^2-25*t^0)/(t^1) = 0 // * t^2
t^1*(1*t^2-25*t^0) = 0
t^1
t^2-25 = 0
t^2-25 = 0
DELTA = 0^2-(-25*1*4)
DELTA = 100
DELTA > 0
t = (100^(1/2)+0)/(1*2) or t = (0-100^(1/2))/(1*2)
t = 5 or t = -5
t in { -5, 5}
t in { -5, 5 }
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