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Math Help - HS Algebra 2-Quadratics, word problem.

  1. #1
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    HS Algebra 2-Quadratics, word problem.

    I'm taking Algebra 2, this is from the quadratics section. I'm not asking you to do my homework, but please, tell me how. I really appreciate the help. Here's the question:

    In an engineering test, a rocket sled is propelled into a target. The sled’s distance d in meters from the target is given by the formula d=-1.5t^2+120 where t is the number of seconds after rocket ignition. How many seconds have passed since rocket ignition when the sled is 10 meters from the target?

    I think most of my issue is that I don't quite know what to do with the 10, but I'm not sure.

    Thank you for taking the time to read my post.
    Last edited by dazygrl02; September 10th 2009 at 07:37 AM. Reason: Forgot a part of the question.
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  2. #2
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    This question didn't come with a formula attached by any chance, did it? Without one, I don't think we have quite enough information to answer the question.
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  3. #3
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    Quote Originally Posted by dazygrl02 View Post
    I'm taking Algebra 2, this is from the quadratics section. I'm not asking you to do my homework, but please, tell me how. I really appreciate the help. Here's the question:

    In an engineering test, a rocket sled is propelled into a target. The sledís distance d in meters from the target is given by the formula where t is the number of seconds after rocket ignition. How many seconds have passed since rocket ignition when the sled is 10 meters from the target?

    I think most of my issue is that I don't quite know what to do with the 10, but I'm not sure.

    Thank you for taking the time to read my post.
    You have a quadratic in t for the distance d(t) travelled in t seconds. You are asked to find the t corresponding to d(t)=10. That is you are being asked to solve the quadratic d(t)=10. This will have two solutions, you want the positive one.

    CB
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  4. #4
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    I typed the question wrong, thanks anyway though.
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