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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-(5/t)-(14/(t^2)) = 0
1-5*t^-1-14*t^-2 = 0
t_1 = t^-1
1-14*t_1^2-5*t_1^1 = 0
1-14*t_1^2-5*t_1 = 0
DELTA = (-5)^2-(-14*1*4)
DELTA = 81
DELTA > 0
t_1 = (81^(1/2)+5)/(-14*2) or t_1 = (5-81^(1/2))/(-14*2)
t_1 = -1/2 or t_1 = 1/7
t_1 = -1/2
t^-1+1/2 = 0
1*t^-1 = -1/2 // : 1
t^-1 = -1/2
-1 < 0
1/(t^1) = -1/2 // * t^1
1 = -1/2*t^1 // : -1/2
-2 = t^1
t = -2
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 { -2, 7 }
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