I believe you are missing the rest of your question...
What information does the zero of the equation 6 = –16x2 + 24x + 1 represent?
In this case
0=-16x2+24x+1-6 .............> -16x2 +24x -5 = 0
If we graph the equation, we can see that the solutions are
x1 = 0.25 and x2 = 1.25
These points represent the moment when the ball is 6 ft above the ground
(0.25 seconds after being thrown and 1.25 seconds after being thrown)
