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Math Help - Quadratics Word Problem (grade11)

  1. #1
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    Quadratics Word Problem (grade11)

    I'm really having trouble with 3 word problems.
    I won't post all three in one thread, but here's the first one.
    ==========================================

    Question: A golfer hits a ball off the tee at 42m/s. The flag is 183m from the tee in the centre of the green, and the green is round with a radius of 9m. Assume the ball went in the right direction.

    Did it land on the green? For this problem use the quadratic function:

    y= x- 9.8x≤ --------------------------> (so that's y=x-9.8≤ OVER v≤)
    ......... v≤

    Where x is the horizontal distance, y is the height of the ball above the ground, and v is the initial velocity of the ball.

    ======================

    Here's what I drew on my paper (remade it online to show you guys)
    LINK:http://i53.tinypic.com/2yzkhfs.png
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  2. #2
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    Re: Quadratics Word Problem (grade11)

    Assuming the golfer hit the ball directly toward the t, it will be on the green as long as it goes y= 183- 9= 174 meters. Since you are given that v= 42 m/s, your formula becomes 174= \frac{x- 9.8x^2}{(42)^2}.
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  3. #3
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    Re: Quadratics Word Problem (grade11)

    So then I solve for x?
    And if you don't mind, how do you write the equation like that? ... so neat looking
    And thanks for replying!

    *sorry I'm really lost and have a headache*
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