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If T2 = 78, then T = 78(1/2) or the square root of 78, or about 8.83.
It has no solutions because the discriminant of b2-4ac is less than zero
T(t + 4)
(t + 7)(t - 1)
2(t2) = 330: t2 = 165: t = 12.85 (2t)2 = 330: 2t = 18.16: t = 9.08