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Edexcel A2 C4 Mathematics June 2016 - Official Thread Watch

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    (Original post by medimidi)
    Thank you!
    No problem
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    Not hearing good things from the AQA maths people, let's hope Edexcel are kinder with their papers.

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    How do you draw this graph ???

    The link is https://aeb44e76c1fb598b02a447aec286...%20Edexcel.pdf

    Its an edexcel practice paper for c3 on physics and maths tutor
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    (Original post by michael242103)
    How do you draw this graph ???

    The link is https://aeb44e76c1fb598b02a447aec286...%20Edexcel.pdf

    Its an edexcel practice paper for c3 on physics and maths tutor
    Sketch the ln x graph (you should know what that looks like) and then transform it via stretching in the x-direction and horizontal translation.
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    (Original post by Zacken)
    Sketch the ln x graph (you should know what that looks like) and then transform it via stretching in the x-direction and horizontal translation.
    Ye but its got a mod and the markscheme shows something completely different ........
    https://aeb44e76c1fb598b02a447aec286...%20Edexcel.pdf
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    (Original post by michael242103)
    Ye but its got a mod and the markscheme shows something completely different ........
    https://aeb44e76c1fb598b02a447aec286...%20Edexcel.pdf
    Yeah, it'll be reflected in the line x=2 since it's of the form y = f(|x|). (which normally gets reflected in the y-axis, but this has been translated, so gets reflected in the line x=2 instead of x=0)
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    (Original post by Zacken)
    Yeah, it'll be reflected in the line x=2 since it's of the form y = f(|x|). (which normally gets reflected in the y-axis, but this has been translated, so gets reflected in the line x=2 instead of x=0)
    is that always the case for something like this? How come its not ln(3|x|-6)??
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    (Original post by Azzer11)
    Not hearing good things from the AQA maths people, let's hope Edexcel are kinder with their papers.

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    I've invested just under 3,000 hours this year on Maths alone. If EdEx ruin my chance of an A*, ...tbc
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    (Original post by michael242103)
    is that always the case for something like this? How come its not ln(3|x|-6)??
    Because the question wants you to plot ln|3x-6| and not ln(3|x| - 6).
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    alright cheers mate

    (Original post by Zacken)
    Because the question wants you to plot ln|3x-6| and not ln(3|x| - 6).
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    (Original post by Zacken)
    Sketch the ln x graph (you should know what that looks like) and then transform it via stretching in the x-direction and horizontal translation.
    When you're transforming x, it's translate first, then stretch.
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    (Original post by sayshay)
    When you're transforming x, it's translate first, then stretch.
    Eh? No. I could do it both different ways if I wanted to...
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    Zacken, if it was ln|3x| - 6, then you would translate by a vector of (0 -6) to give two coordinates of (-1/3, -6) and (1/3, -6), right?
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    (Original post by Don Pedro K.)
    Zacken, if it was ln|3x| - 6, then you would translate by a vector of (0 -6) to give two coordinates of (-1/3, -6) and (1/3, -6), right?
    You'd then need to stretch it by scale factor 1/3 in the x-direction. So translate down by 6 then stretch horizontally by 1/3
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    (Original post by Zacken)
    You'd then need to stretch it by scale factor 1/3 in the x-direction. So translate down by 6 then stretch horizontally by 1/3
    Oh right, so the x coordinate would change when you translate down by 6, yeah. So x would equal 1/3(e^6) and -1/3(e^6)?
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    (Original post by michael242103)
    Ye but its got a mod and the markscheme shows something completely different ........
    https://aeb44e76c1fb598b02a447aec286...%20Edexcel.pdf
    those practice pprs written by edexcel?
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    i dont think so heres the link:http://www.physicsandmathstutor.com/...xcel-practice/

    Its on physics and maths tutors website under edexcel practice papers but not sure...

    (Original post by Pablo Picasso)
    those practice pprs written by edexcel?
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    (Original post by michael242103)
    i dont think so heres the link:http://www.physicsandmathstutor.com/...xcel-practice/

    Its on physics and maths tutors website under edexcel practice papers but not sure...
    Thanks <3
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    (Original post by Zacken)
    Eh? No. I could do it both different ways if I wanted to...

    Say f(x) was a particular function, when you draw y= f(3x-5) you'd have to shift to the right by 5 first, and then stretch along the X axis by scale factor of 1/3. Doing it the other way around will give you a different overall transformation.

    (Original post by michael242103)
    Ye but its got a mod and the markscheme shows something completely different ........
    https://aeb44e76c1fb598b02a447aec286...%20Edexcel.pdf
    When you read the question on the actual paper, there's no ln? It just says f(X) = a|2x-a|, and if you use that, you get what the mark scheme says.
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    (Original post by Pablo Picasso)
    I've invested just under 3,000 hours this year on Maths alone. If EdEx ruin my chance of an A*, ...tbc
    I thought you did AQA? Or were you just trolling on the AQA thread saying it was a 'straightforward' exam?
 
 
 
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