The distance of a car from a certain intersection after t seconds is given by d(t) = 14 + 4t - t2. When (that is, for which values of t) is the car 14 units away from the reference point?
solve
14 = 14+4t-t^2
t^2 - 4t=0
easy to solve
14 = 14+4t-t^2
t^2 - 4t=0
easy to solve