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D( t )
t-9 = 0
t-9 = 0
t-9 = 0
t-9 = 0 // + 9
t = 9
t in (-oo:9) U (9:+oo)
(t^2-(5*t)-36)/(t-9) = 0
(t^2-5*t-36)/(t-9) = 0
t^2-5*t-36 = 0
t^2-5*t-36 = 0
DELTA = (-5)^2-(-36*1*4)
DELTA = 169
DELTA > 0
t = (169^(1/2)+5)/(1*2) or t = (5-169^(1/2))/(1*2)
t = 9 or t = -4
(t+4)*(t-9) = 0
t+4 = 0
t+4 = 0 // - 4
t = -4
t = -4
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