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    http://www.mei.org.uk/files/papers/J..._2013_June.pdf


    12 iii on this paper

    ive got to x^2 - (k+2)x +2k +1 = 0 and i know i need to use b^2-4ac but how would i use it with this equation with so many parts to find the value of k?
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    (Original post by liverpool2044)
    http://www.mei.org.uk/files/papers/J..._2013_June.pdf


    12 iii on this paper

    ive got to x^2 - (k+2)x +2k +1 = 0 and i know i need to use b^2-4ac but how would i use it with this equation with so many parts to find the value of k?
    What must the discriminant be for a tangent?
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    Im not sure:/
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    (Original post by liverpool2044)
    Im not sure:/
    OK, go back a step!

    What's the definition of a tangent?
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    Straight line that touches a curve?
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    (Original post by liverpool2044)
    Straight line that touches a curve?
    Good!

    And what does "touches" mean in terms of the number of intersections of the line and the curve?
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    Just the one intersection? I know ill have to use b^2-4ac but i dont know what to put where with the equation ive got
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    (Original post by liverpool2044)
    Just the one intersection? I know ill have to use b^2-4ac but i dont know what to put where with the equation ive got
    One intersection means one repeated root of the quadratic equatione. What is the condition for that in terms of the discriminant?

    (Btw, you need to quote me if you want me to see that you've replied!)
 
 
 
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