Question 311949
{{{s = t^2 + 8t}}}
{{{s = 9}}} ft
{{{9 = t^2 + 8t}}}
{{{t^2 + 8t - 9 = 0}}}
{{{(t - 1)(t + 9) = 0}}}
{{{t = 1}}} (can't use negative answer)
It will take 1 sec for the object to move 9 ft