Jordan tosses a coin off a bridge into the riverThe height of the cain, f(x) , feet, is represented by the function f(x) = - 16x ^ 2 - 16x + 60 where x represents the time. In seconds, how long is the coin in the air?
We only need to find the positive root......this will give us the time
-16x^2 - 16x + 60 = 0
16x^2 + 16x - 60 = 0 divide through by 4
4x^2 + 4x - 15 = 0 factor
(2x - 3) ( 2x + 5) = 0
Set the first factor = 0 and solve for x
2x - 3 = 0
2x = 3
x = 3/2 sec = 1.5 sec
