Can someone help me with this college algebra 2 word problem?!!

Question

NASA launches a rocket at  seconds. Its height, in meters above sea-level, as a function of time is given by . Assuming that the rocket will splash down into the ocean, at what time does splashdown occur? 

Answer 1

It splashes down at the time when h(t) = 0.

-4.9t² + 247t + 388 = 0

Solve for t using the quadratic formula, which you should be familiar with. You will get a positive and a negative solution. Since time starts at t = 0, the positive solution will be the correct answer.