# Math Help - 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.
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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- 9.8x² --------------------------> (so that's y=x-9.8² OVER v²)
......... v²

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.

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Here's what I drew on my paper (remade it online to show you guys)

2. ## 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 $174= \frac{x- 9.8x^2}{(42)^2}$.

3. ## 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*