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Math Help - How to find the horizontal distance in this quadratic formula?

  1. #1
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    How to find the horizontal distance in this quadratic formula?

    "An archer's arrow follows a parabolic path. The height of the arrow, f(x) in feet, can be modeled by:

    f(x) = -0.005x^2 +2x +5 ,

    where x is the arrow's horizontal distance in feet."

    I've done the quadratic formula and the result didn't seem reasonable..
    Is there a specific formula for problems like these?
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  2. #2
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    Re: How to find the horizontal distance in this quadratic formula?

    Quote Originally Posted by nojnotnow View Post
    "An archer's arrow follows a parabolic path. The height of the arrow, f(x) in feet, can be modeled by:

    f(x) = -0.005x^2 +2x +5 ,

    where x is the arrow's horizontal distance in feet."

    I've done the quadratic formula and the result didn't seem reasonable..
    Is there a specific formula for problems like these?
    My solution seems reasonable ... what did you get?
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  3. #3
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    Re: How to find the horizontal distance in this quadratic formula?

    I threw the paper away with my work on it already lol

    If you don't mind what was your answer and how did you work it out?
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  4. #4
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    Re: How to find the horizontal distance in this quadratic formula?

    Quote Originally Posted by nojnotnow View Post
    I threw the paper away with my work on it already lol

    If you don't mind what was your answer and how did you work it out?
    f(x) = 0 when it hits the ground. It's just using the quadratic formula ... it's your problem, you work it out.
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  5. #5
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    Re: How to find the horizontal distance in this quadratic formula?

    I GOT IT, 402.48

    I didn't the negative form of the quadratic formula, I just did the positive form which resulted in a negative distance..

    That was my bad..
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