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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)
8-(1/t) = 7/(t^2) // - 7/(t^2)
8-(1/t)-(7/(t^2)) = 0
8-t^-1-7*t^-2 = 0
t_1 = t^-1
8-7*t_1^2-1*t_1^1 = 0
8-7*t_1^2-t_1 = 0
DELTA = (-1)^2-(-7*4*8)
DELTA = 225
DELTA > 0
t_1 = (225^(1/2)+1)/(-7*2) or t_1 = (1-225^(1/2))/(-7*2)
t_1 = -8/7 or t_1 = 1
t_1 = -8/7
t^-1+8/7 = 0
1*t^-1 = -8/7 // : 1
t^-1 = -8/7
-1 < 0
1/(t^1) = -8/7 // * t^1
1 = -8/7*t^1 // : -8/7
-7/8 = t^1
t = -7/8
t_1 = 1
t^-1-1 = 0
1*t^-1 = 1 // : 1
t^-1 = 1
-1 < 0
1/(t^1) = 1 // * t^1
1 = 1*t^1 // : 1
1 = t^1
t = 1
t in { -7/8, 1 }
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