Since we want to know when it will hit the ground we are looking for a value of t such that remember h is the height of the flare.

so we need to solve so if we factor we get..

so our two solutions are t=-2 and t=7

We need to disreguard one solution (because it doesn't make sense in the context of the problem) t=-2 so it will take 7 seconds for the flare to hit the ground.

Yeah