If a football player passes a football from 4 feet off the ground with an initial velocity of 36 feet per second, how long will it take the football to hit the ground? Use the equation h = –16t2 + 36t + 4.

Using the Quadratic Formula answer please

Question

If a football player passes a football from 4 feet off the ground with an initial velocity of 36 feet per second, how long will it take the football to hit the ground? Use the equation h = –16t2 + 36t + 4.

Using the Quadratic Formula answer please

anonymous · Answer

–16t^2 + 36t + 4 = 0

-4 (4t^2 - 9t - 1) = 0

(4t^2 - 9t - 1) = 0

anonymous · Answer

0 = -16t^ + 36t + 4
16t^2 - 36t - 4 = 0
4t^2 - 9t - 1 = 0
solve for t  - ignore negative root

anonymous · Answer

this wont factorise so you'll need to use quadratic formula