150k views
3 votes
TL

02:50:34
The quadratic model f(x) = -5x2 + 200 represents the approximate height, in meters, of a ball x seconds after being
dropped. The ball is 50 meters from the ground after about how many seconds?
2.45
3.16
5.48
7.07
Save and Exit
Submit
Mark this and

User Matteoh
by
8.2k points

1 Answer

3 votes

Answer:

≈ 5.48 sec

Explanation:

Equate the height f(x) to 50, that is

- 5x² + 200 = 50 ( subtract 200 from both sides )

- 5x² = - 150 ( divide both sides by - 5 )

x² = 30 ( take the square root of both sides )

x =
√(30) ≈ 5.48 ( to 2 dec. places )

User Aerus
by
8.0k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories