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t in (-oo:+oo)
28 = t^2-(t/2) // - t^2-(t/2)
t/2-t^2+28 = 0
1/2*t-t^2+28 = 0
DELTA = (1/2)^2-(-1*4*28)
DELTA = 449/4
DELTA > 0
t = ((449/4)^(1/2)-1/2)/(-1*2) or t = (-(449/4)^(1/2)-1/2)/(-1*2)
t = ((449/4)^(1/2)-1/2)/(-2) or t = ((449/4)^(1/2)+1/2)/2
t in { ((449/4)^(1/2)-1/2)/(-2), ((449/4)^(1/2)+1/2)/2 }
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