Question

The height above the ground, h, in feet, of a bullet fired upward is given by the formula

h = −162 + 80 + 224. Find the number of seconds after being fired the bullet hits the ground.

Answer 1

After 7 seconds it hits the ground.

h= -16^2 + 80x + 224

(I'm assuming this is what you meant, because these problems are generally quadratic)

Use quadratic formula to find when it hits the ground (get zeros)

x = -2, x = 7

After 7 seconds it hits the ground.