SOLUTION: A kicker starts a football game by "kicking off". The quadratic function y = -6x 2 + 12x models the football's height after x seconds. How long, in seconds, is the football in th

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equation Customizable Word Problems -> SOLUTION: A kicker starts a football game by "kicking off". The quadratic function y = -6x 2 + 12x models the football's height after x seconds. How long, in seconds, is the football in th      Log On


   

Question 1161596: A kicker starts a football game by "kicking off". The quadratic function y = -6x 2 + 12x models the football's height after x seconds. How long, in seconds, is the football in the air?
Answer by greenestamps(13196) About Me  (Show Source):
You can put this solution on YOUR website!


The number of seconds that it is in the air is the number of seconds until the height returns to 0.

-6x%5E2%2B12x+=+0
-6%28x%29%28x-2%29+=+0

The football is at height 0 at x = 0 and x=2; it is in the air for 2 seconds.