trystan018
trystan018 trystan018
  • 14-11-2019
  • Mathematics
contestada

Can someone please read that and give me an answer, i’ve been stuck on it for awhile.

Can someone please read that and give me an answer ive been stuck on it for awhile class=

Respuesta :

jimrgrant1 jimrgrant1
  • 14-11-2019

Answer:

after 21 seconds

Step-by-step explanation:

Given

h = - 16t² + 272t + 1344

When the ball strikes the ground then h = 0, that is

- 16t² + 272t + 1344 = 0 ( divide through by - 16 )

t² - 17t - 84 = 0 ← in standard form

(t - 21)(t + 4) = 0 ← in factored form

Equate each factor to zero and solve for t

t - 21 = 0 ⇒ t = 21

t + 4 = 0 ⇒ t = - 4

However t > 0 thus t = 21

The ball strikes the ground after 21 seconds.

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