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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
2/t-((3*t)/2) = 7 // - 7
2/t-((3*t)/2)-7 = 0
(-3/2)*t+2/t-7 = 0
2*t^-1-3/2*t^1-7*t^0 = 0
(2*t^0-3/2*t^2-7*t^1)/(t^1) = 0 // * t^2
t^1*(2*t^0-3/2*t^2-7*t^1) = 0
t^1
(-3/2)*t^2-7*t+2 = 0
(-3/2)*t^2-7*t+2 = 0
DELTA = (-7)^2-(2*4*(-3/2))
DELTA = 61
DELTA > 0
t = (61^(1/2)+7)/(2*(-3/2)) or t = (7-61^(1/2))/(2*(-3/2))
t = (61^(1/2)+7)/(-3) or t = (7-61^(1/2))/(-3)
t in { (61^(1/2)+7)/(-3), (7-61^(1/2))/(-3)}
t in { (61^(1/2)+7)/(-3), (7-61^(1/2))/(-3) }
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