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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
t+8/t = -9 // + 9
t+8/t+9 = 0
1*t^1+8*t^-1+9*t^0 = 0
(1*t^2+9*t^1+8*t^0)/(t^1) = 0 // * t^2
t^1*(1*t^2+9*t^1+8*t^0) = 0
t^1
t^2+9*t+8 = 0
t^2+9*t+8 = 0
DELTA = 9^2-(1*4*8)
DELTA = 49
DELTA > 0
t = (49^(1/2)-9)/(1*2) or t = (-49^(1/2)-9)/(1*2)
t = -1 or t = -8
t in { -8, -1}
t in { -8, -1 }
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