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D( t )
t^2 = 0
t = 0
t^2 = 0
t^2 = 0
1*t^2 = 0 // : 1
t^2 = 0
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
1-(2/t)-(35/(t^2)) = 0
1-2*t^-1-35*t^-2 = 0
t_1 = t^-1
1-35*t_1^2-2*t_1^1 = 0
1-35*t_1^2-2*t_1 = 0
DELTA = (-2)^2-(-35*1*4)
DELTA = 144
DELTA > 0
t_1 = (144^(1/2)+2)/(-35*2) or t_1 = (2-144^(1/2))/(-35*2)
t_1 = -1/5 or t_1 = 1/7
t_1 = -1/5
t^-1+1/5 = 0
1*t^-1 = -1/5 // : 1
t^-1 = -1/5
-1 < 0
1/(t^1) = -1/5 // * t^1
1 = -1/5*t^1 // : -1/5
-5 = t^1
t = -5
t_1 = 1/7
t^-1-1/7 = 0
1*t^-1 = 1/7 // : 1
t^-1 = 1/7
-1 < 0
1/(t^1) = 1/7 // * t^1
1 = 1/7*t^1 // : 1/7
7 = t^1
t = 7
t in { -5, 7 }
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