5t
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5t - 7 = 11 5t - 7 + 7 = 11 + 7 5t = 18 5t/5 = 18/5 t = 18/5 t = 3 3/5
5t + rt = t(5+r)
5t is5t is5t is5t is
5t^2 - 25t - 10 = 0 Looks like a quadratic formula problem, and it might be ugly. The discriminant, by simple visual inspection, tells me this has two real roots. Let us divide through by 5 to simplify things t^2 - 5t - 2 = 0 different parabola, but crosses X axis at same place t = -b +/- sqrt(b^2-4ac)/2a a = 1 b = -5 c = -2 -(-5) +/- sqrt[(-5)^2 - 4(1)(-2)]/2(1) 5 +/- sqrt(17)/2 ugly, but true
between 4 and 5.it is 4.47