SOLUTION: A projectile is shot vertically upward. Its height h in feet after time t in seconds may be expressed by the formula h = 96t - 16t^2. Find t when h = 80.0 feet.

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: A projectile is shot vertically upward. Its height h in feet after time t in seconds may be expressed by the formula h = 96t - 16t^2. Find t when h = 80.0 feet.       Log On


   

Question 957350: A projectile is shot vertically upward. Its height h in feet after time t in seconds may be expressed by the formula h = 96t - 16t^2.
Find t when h = 80.0 feet.
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
80.0ft=96t-16t%5E2
5ft=6t-t%5E2
t%5E2-6t%2B5ft=0
%28t-1%29=0 or %28t-5%29=0
t=1 or t=5 ANSWER: When h=80.0 feet, t=1 or 5