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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
5*t-(((6*(5/t)*t^2)/25)*t)-25 = 0
(-6/5)*t^2+5*t-25 = 0
5*t-6/5*t^2-25 = 0
DELTA = 5^2-(-25*(-6/5)*4)
DELTA = -95
DELTA < 0
t belongs to the empty set
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