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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
t-(48/t) = 8 // - 8
t-(48/t)-8 = 0
t-48*t^-1-8 = 0
1*t^1-48*t^-1-8*t^0 = 0
(1*t^2-8*t^1-48*t^0)/(t^1) = 0 // * t^2
t^1*(1*t^2-8*t^1-48*t^0) = 0
t^1
t^2-8*t-48 = 0
t^2-8*t-48 = 0
DELTA = (-8)^2-(-48*1*4)
DELTA = 256
DELTA > 0
t = (256^(1/2)+8)/(1*2) or t = (8-256^(1/2))/(1*2)
t = 12 or t = -4
t in { -4, 12}
t in { -4, 12 }
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