Question

Antoine stands on a balcony and throws a ball to his dog, who is at ground level.
The ball's height (in meters above the ground), x seconds after Antoine threw it, is modeled by:

h(x) = -2x^2 + 4x + 16

How many seconds after being thrown will the ball hit the ground?

Answer 1

Answer:

h =0 after ball hit ground

x^2 - 2x - 8 =0

-b +- √b^2-4ac /2a

2+-6 /2 t = 4 , -2

t= 4 sec time always positive