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14 March, 03:19

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A hovercraft takes off from a platform.

Its height (in meters), 3 seconds after takeoff, is modeled by

h (x) = - (x - 11) (x + 3)

How many seconds after takeoff will the hovercraft land on the ground

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  1. 14 March, 03:26
    0
    14

    Step-by-step explanation:

    when it lands on the ground, h (x) = 0

    x = - 3, x = 11

    since it is 3 second after takeoff,

    x = - 3 + 3 = 0

    x = 11+3 = 14
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