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Math Help - Solving Problems Involving Quadratic Relations.

  1. #1
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    Solving Problems Involving Quadratic Relations.

    its on quadratic relations and different forms ie. standard factored vertex exc all word problems (there are 3 questions)
    If you understand this please help!
    Looking for someone to do this out of generosity
    Big Pics

    I dont know if these answers are right, feel free to correct me on them.

    Last edited by mr fantastic; November 14th 2011 at 02:24 AM. Reason: Title.
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  2. #2
    Super Member Quacky's Avatar
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    Re: Solving Problems Involving Quadratic Relations Help Please

    Is this something upon which you are being assessed?
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  3. #3
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    Re: Solving Problems Involving Quadratic Relations Help Please

    No this is a test review and i need help understand these questions because the test is on monday (tommorow)
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  4. #4
    Super Member Quacky's Avatar
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    Re: Solving Problems Involving Quadratic Relations Help Please

    Well we have:

    h=-0.04(d-19)^2+14.4
    1) Is fine except that I would advise you to label the points of intersection with the axis.
    Your factors are correct. The distance is correct.You're missing a minus sign on the ax^2+bx+c=0 form.

    Moving onto 2: The rocket will hit the ground when h=0

    Can you solve
    -4.9t^2+44.1t=0? Take out a common factor of t and then solve.

    For the max height, why not put the equation into vertex form? Alternatively, it will be the point halfway between the x-intercepts, so you could find this point and then substitute it into the formula.

    I don't feel like the COMM part is something I can answer without knowing what exactly the examiners are looking for in an answer - for that, I'd consult a teacher.
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  5. #5
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    Re: Solving Problems Involving Quadratic Relations Help Please

    I have fixed number 1, but i am still confused for #2 on how to remove the common factor then solve. If you can further explain 2 than i should be able to turn it into factored form. As for communications mark that does not matter on this, it will matter on the actual test.
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  6. #6
    Super Member Quacky's Avatar
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    Re: Solving Problems Involving Quadratic Relations Help Please

    -4.9t^2+44.1t=0

    Divide both sides by 4.9:

    -t^2+9t=0

    t(9-t)=0
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  7. #7
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    Re: Solving Problems Involving Quadratic Relations Help Please

    Once i do that do i FOIL so it will equal ?
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  8. #8
    Super Member Quacky's Avatar
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    Re: Solving Problems Involving Quadratic Relations Help Please

    The equation marks the flight path of a rocket. We already know the equation of the quadratic, which is the height, h(t) relates to the time, t, in seconds after launch. The equation is h(t)=-4.9t^2+44.1t. The height will be 0 when h(t)=0 so you are being asked to solve

    0=-4.9t^2+44.1t
    I noticed a common factor of 4.9 (knowing my 4.9 times table has helped immeasurably in life) so divided through both sides by 4.9. This gave:

    0=-t^2+9t
    There is now a common factor of t, which can be factored:
    t(-t+9)=0
    By the null factor law, there are only two ways this can be possible: if t=0 or if -t+9=0
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  9. #9
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    Re: Solving Problems Involving Quadratic Relations Help Please

    Ok, but once i get What is the next step? because if or than i dont know how to get there.
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  10. #10
    Super Member Quacky's Avatar
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    Re: Solving Problems Involving Quadratic Relations Help Please

    If you cannot solve:
    -t+9=0, then I am incredibly concerned about your test tomorrow! Can you not see that this means t=9?
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  11. #11
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    Re: Solving Problems Involving Quadratic Relations Help Please

    No i did not see this because i have not done it this exact way before, the teacher does not explain these kinds of things well which is why i have to come online to get the help required.
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  12. #12
    Super Member Quacky's Avatar
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    Re: Solving Problems Involving Quadratic Relations Help Please

    Ok. What about part b? Can you put the quadratic into vertex form? (Which is the form it was in at the start of q1)
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    Re: Solving Problems Involving Quadratic Relations Help Please

    Im not sure if i did it right but i got 793.8m on for b.

    I have to go to bed now so i wont be able to correct it right now if its wrong.
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  14. #14
    Super Member Quacky's Avatar
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    Re: Solving Problems Involving Quadratic Relations Help Please

    I think you really need to talk to someone because the problems you're having will take time to correct and can't be rectified over a quick forums session. Either talk to a parent or the teacher or find a tutor or study group because obviously you're not taking in the information that you require, and it's probably not your fault but it is up to you to control it. I would try to tell the teacher there are problems before starting the test tomorrow - he will understand. And he can either find out from you, or from a failed test paper and I think honestly, it will help you a lot in the long run to have a talk with him.
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  15. #15
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    Re: Solving Problems Involving Quadratic Relations Help Please

    Yes my school does have a student help room for math so im most likely going to go to that. Im one of those people who understand it when its taught but forget when i try to do it, the teacher just does not continually do the same questions and moves on too quick. I am not the only person who thinks this, the class average is failing.
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