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    Really quick (and probably easy) question.

    Given 2qx^2 + qx - 1 = 0 where q has no real roots

    I found q^2 + 8q<0

    Can someone please tell me how to find the possible values of q? I know you have to factorise but according to the markscheme you have make it =

    Side note: how do you make the text into formula style?

    Thank you
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    http://www.youtube.com/watch?v=EyupY...eature=related

    this should help
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    (Original post by heymynameisben)
    Really quick (and probably easy) question.

    Given 2qx^2 + qx - 1 = 0 where q has no real roots

    I found q^2 + 8q<0

    Can someone please tell me how to find the possible values of q? I know you have to factorise but according to the markscheme you have make it =

    Side note: how do you make the text into formula style?

    Thank you
    Factorise out the q so you now have q(q+8)&lt;0
    Then sketch the graph of that (you should be able to tell where the roots are).
    Then look at where the graph is below zero and the possible values of q will be given as a range between two points in this case.
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    Wow thats so cool, thanks very much!
 
 
 
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