Question

I need help plz

A diver dives from a 9-foot-high platform with an initial speed of 16 feet per second. The height, h, of the
diver can be modeled by the equation ℎ = −162t^2 − 16t+ 9, where t represents time in seconds. How
long will it be before the diver hits the water?

Answer 1

hit the water means h is zero.
-162t²-16t+9=0
use the quadratic formula to solve: I got the answer t=0.19 second or -0.29 second
ignore the negative answer, t=0.19