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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
7/t-2 = 7*t+4 // - 7*t+4
7/t-(7*t)-4-2 = 0
7/t-7*t-4-2 = 0
7*t^-1-7*t^1-6*t^0 = 0
(7*t^0-7*t^2-6*t^1)/(t^1) = 0 // * t^2
t^1*(7*t^0-7*t^2-6*t^1) = 0
t^1
7-7*t^2-6*t = 0
7-7*t^2-6*t = 0
DELTA = (-6)^2-(-7*4*7)
DELTA = 232
DELTA > 0
t = (232^(1/2)+6)/(-7*2) or t = (6-232^(1/2))/(-7*2)
t = (2*58^(1/2)+6)/(-14) or t = (6-2*58^(1/2))/(-14)
t in { (2*58^(1/2)+6)/(-14), (6-2*58^(1/2))/(-14)}
t in { (2*58^(1/2)+6)/(-14), (6-2*58^(1/2))/(-14) }
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