Question

The height, h, in feet of a golf ball above the ground after being hit into the air is given by the equation, h = -16t^2 + 64t, where t is the number of seconds elapsed since the ball was hit. How many seconds does it take for the golf ball to hit the ground?

It will take _______________ seconds for the ball to hit the ground.

Answer 1

when h is zero it hit the ground.so put h=0 and solve for t.

Answer 2

16t^2-64t=0

Answer 3

16 t (t-4)=0