How To Problem Solve With Quadratics

Question

an object is dropped from 28 feet below the tip of the pinnacle atop a 928 ft tall building. the height H of the object after T seconds is given by the equation h=-16t^2 +900. find how many seconds pass before the object reaches the ground

Answer 1

Here is a video I made that might help illustrate the situation, and perhaps help with future problems of these sort.

https://drive.google.com/file/d/1SmTuKGLd6klwrY5UahcLeqFHhITV-VT_/view?usp=sharing

Answer 2

0 = -16t² + 900

-900 = -16t²

56.25 = t²

±7.5 = t