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Math Help - parabola problem

  1. #1
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    parabola problem

    hi all I have a question, and after a few hours of looking in my books I can`t find the answer.

    I have the poin (-4,56) and I am asked to show if it is on the parabola, but I just cant remeber or find the solution?

    sorry to be a pain

    Dave
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  2. #2
    A riddle wrapped in an enigma
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    Re: parabola problem

    Quote Originally Posted by davellew69 View Post
    hi all I have a question, and after a few hours of looking in my books I can`t find the answer.

    I have the poin (-4,56) and I am asked to show if it is on the parabola, but I just cant remeber or find the solution?

    sorry to be a pain

    Dave
    Hi davellew69,

    Do you have the equation of the parabola? If so, substitute the coordinates you have into the equation and see if it makes it true. You really haven't given much detail to work with.
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  3. #3
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    Re: parabola problem

    the equation is y+2x^2-7x-4 but I`m not sure what you mean by substuting
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  4. #4
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    Re: parabola problem

    Quote Originally Posted by davellew69 View Post
    the equation is y+2x^2-7x-4
    Sorry, that's not an equation. Is it y=2x^2-7x-4? I think it is. Now, substitute your coordinates in for x and y and see if it is true.

    (-4, 56) \Longrightarrow 56 = 2(-4)^2 - 7(-4)-4

    Is that true? If it is, then the point (-4, 56) lies on the parabola.
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  5. #5
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    Re: parabola problem

    lol got it, thanks, I must seem a right plonker
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  6. #6
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    Re: parabola problem

    Quote Originally Posted by davellew69 View Post
    lol got it, thanks, I must seem a right plonker
    No worries, mate.
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