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Math Help - Quadratic Equation

  1. #1
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    Exclamation Quadratic Equation

    Can anyone work this hard question out for me???

    1) An object is thrown form a building and the height above the ground, y is given by the equation y=40 + 80t - 5t^2 where t is the time of flight(in seconds).

    b) What is the height after 4 seconds?

    c) At what times is the height 120m?
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  2. #2
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    Quote Originally Posted by GAVREED2 View Post
    Can anyone work this hard question out for me???

    1) An object is thrown form a building and the height above the ground, y is given by the equation y=40 + 80t - 5t^2 where t is the time of flight(in seconds).

    b) What is the height after 4 seconds?

    c) At what times is the height 120m?
    For b) just plug in t=4

    For c) solve the equation

    120=40+80t-5t^2 \iff 5t^2-80t+80=0 \iff t^2-16t+16=0

    can you finish from here
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