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Math Help - finding x intercepts of a parabolla

  1. #1
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    finding x intercepts of a parabolla

    help...I have been at the following for 3 hours and am so lost

    I have the equation y=2x^2-7x-4 and I am trying to find the x and y intercept ( for a parabolla)

    I have found the y intercept which is-4 but I`m lost on finding the x intercept, would I use the quadratic formula , if so am I correct that this way will give me both intercepts (x and y)

    I have tried factoring the above to get x intercept but have got so confused.

    not sure now which way to go

    Dave
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  2. #2
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    Re: finding x intercepts of a parabolla

    2x^2 - 7x - 4 = 0

    (2x + 1)(x - 4) = 0

    finish it
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  3. #3
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    Re: finding x intercepts of a parabolla

    thanks, now I see it
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  4. #4
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    Re: finding x intercepts of a parabolla

    soory I thought I had it, but i`m still lost, I can`t see how you get to your answer in brackets, , and how from there I get the intercepts

    Dave
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  5. #5
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    Re: finding x intercepts of a parabolla

    Quote Originally Posted by davellew69 View Post
    soory I thought I had it, but i`m still lost, I can`t see how you get to your answer in brackets, , and how from there I get the intercepts

    Dave
    then you need to learn how to factor quadratic equations and how to use the zero product property ...

    Solving Quadratic Equations: Solving by Factoring
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  6. #6
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    Re: finding x intercepts of a parabolla

    thanks for the link
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