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31 July, 09:08

A ball is thrown upward from a building. The height h after t seconds is determined from the quadratic equation h (t) = t^2-8t-48. Find after how many seconds the ball will touch the ground.

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  1. 31 July, 11:09
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    12 seconds.

    Step-by-step explanation:

    When the ball hits the ground h (t) = 0:

    t^2 - 8t - 48 = 0

    (t - 12) (t + 4) = 0

    t = 12, - 4 (we ignore the negative).

    The required time = 12 seconds.
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