Question

A model rocket is launched into the air from ground level.

The height, in feet, is modeled by p(x) = -16x2 + 32x, where x is
the number of elapsed seconds. What is the total number of seconds
the model rocket will be in the air?
(1)
(3) 0

Answer 1

`p(x)=-16x^2+32x </p><p> p(x)=0`

`-16x^2+32x = 0`

`-16x(x-2)=0`

`x_1=0, x_2=2`

Rocket will be in the air for 2 seconds.