Louis sets off a firework. The height of the firework at the time t seconds is given by h (t) 16t^2+128t.
Use the quadratic formula to estimate when into the trip the rocket is 64 feet high.

A
at about 0.4 seconds and about 7.6 seconds

B
at about 0.8 second and about 5.2 seconds

C
at about 1.1 seconds and about 6.8 seconds

D
at about 0.5 seconds and about 7.5 seconds