SOLUTION: A soccer ball is kicked in the air the height h(t) of the ball in metres according to time in seconds is expressed as a function h(t) = -2t^2+8t. For what interval of t does the he

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons -> SOLUTION: A soccer ball is kicked in the air the height h(t) of the ball in metres according to time in seconds is expressed as a function h(t) = -2t^2+8t. For what interval of t does the he      Log On


   

Question 672785: A soccer ball is kicked in the air the height h(t) of the ball in metres according to time in seconds is expressed as a function h(t) = -2t^2+8t. For what interval of t does the height of the ball increase??
Answer by stanbon(75887) About Me  (Show Source):
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A soccer ball is kicked in the air the height h(t) of the ball in metres according to time in seconds is expressed as a function h(t) = -2t^2+8t. For what interval of t does the height of the ball increase??
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Vertex occurs at t = -b/(2a) = -8/(2*-2) = 2 seconds
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Increase iinterval: (0,2)
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Cheers,
Stan H.