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D( t )
t = 0
t+4 = 0
t = 0
t = 0
t+4 = 0
t+4 = 0
t+4 = 0 // - 4
t = -4
t in (-oo:-4) U (-4:0) U (0:+oo)
6/(t+4)+6/t = 1 // - 1
6/(t+4)+6/t-1 = 0
(6*t)/(t*(t+4))+(6*(t+4))/(t*(t+4))+(-1*t*(t+4))/(t*(t+4)) = 0
6*(t+4)-1*t*(t+4)+6*t = 0
12*t-t^2-4*t+24 = 0
8*t-t^2+24 = 0
8*t-t^2+24 = 0
8*t-t^2+24 = 0
DELTA = 8^2-(-1*4*24)
DELTA = 160
DELTA > 0
t = (160^(1/2)-8)/(-1*2) or t = (-160^(1/2)-8)/(-1*2)
t = (4*10^(1/2)-8)/(-2) or t = (-4*10^(1/2)-8)/(-2)
(t-((4*10^(1/2)-8)/(-2)))*(t-((-4*10^(1/2)-8)/(-2))) = 0
((t-((4*10^(1/2)-8)/(-2)))*(t-((-4*10^(1/2)-8)/(-2))))/(t*(t+4)) = 0
((t-((4*10^(1/2)-8)/(-2)))*(t-((-4*10^(1/2)-8)/(-2))))/(t*(t+4)) = 0 // * t*(t+4)
(t-((4*10^(1/2)-8)/(-2)))*(t-((-4*10^(1/2)-8)/(-2))) = 0
( t-((-4*10^(1/2)-8)/(-2)) )
t-((-4*10^(1/2)-8)/(-2)) = 0 // + (-4*10^(1/2)-8)/(-2)
t = (-4*10^(1/2)-8)/(-2)
( t-((4*10^(1/2)-8)/(-2)) )
t-((4*10^(1/2)-8)/(-2)) = 0 // + (4*10^(1/2)-8)/(-2)
t = (4*10^(1/2)-8)/(-2)
t in { (-4*10^(1/2)-8)/(-2), (4*10^(1/2)-8)/(-2) }
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