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t in (-oo:+oo)
t^2-(t/2)-10 = 0
t^2-1/2*t-10 = 0
DELTA = (-1/2)^2-(-10*1*4)
DELTA = 161/4
DELTA > 0
t = ((161/4)^(1/2)+1/2)/(1*2) or t = (1/2-(161/4)^(1/2))/(1*2)
t = ((161/4)^(1/2)+1/2)/2 or t = (1/2-(161/4)^(1/2))/2
t in { (1/2-(161/4)^(1/2))/2, ((161/4)^(1/2)+1/2)/2 }
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