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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
2*t = 8/t-3 // - 8/t-3
2*t-(8/t)+3 = 0
2*t-8*t^-1+3 = 0
2*t^1-8*t^-1+3*t^0 = 0
(2*t^2+3*t^1-8*t^0)/(t^1) = 0 // * t^2
t^1*(2*t^2+3*t^1-8*t^0) = 0
t^1
2*t^2+3*t-8 = 0
2*t^2+3*t-8 = 0
DELTA = 3^2-(-8*2*4)
DELTA = 73
DELTA > 0
t = (73^(1/2)-3)/(2*2) or t = (-73^(1/2)-3)/(2*2)
t = (73^(1/2)-3)/4 or t = (-(73^(1/2)+3))/4
t in { (-(73^(1/2)+3))/4, (73^(1/2)-3)/4}
t in { (-(73^(1/2)+3))/4, (73^(1/2)-3)/4 }
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