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    (Original post by gabby07)
    Hi can I just briefly turn attention to a C2 question I'm having a bit of trouble with (I know it ought to be easy, and I'm sure it is...!)

    Can anyone help me out with this:

    7x = 2x+1

    Solve for x.

    So far, I've got up to here:
    log7x = log2x+1
    xlog7 = (x+1)log2

    I have no idea where to go from here! Normally you can just divide by logs to find the x solution and then act as necessary but the way to do this isn't appearing in my head! Thanks!!
    xlog7 = (x + 1)log2
    (log7)/(log2) = (x + 1)/x
    (log7)/(log2) = 1 + 1/x
    (log7)/(log2) - 1 = 1/x
    x = 1/((log7)/log2) - 1)

    Probably wrong... It's been a long year since I did any C2.
    I'm pretty sure there's a (Not MEI) OCR C2 post somewhere on TSR for you
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    (Original post by Madhutty)
    I think it was out of 5...

    2 for finding 3 points
    2 for finding base + perpendicular height
    1 for final answer (40 square units)

    (Probably)
    It was only 4 marks.

    I would say M1, 2 for the points, since this was the main brief of the question.
    M3 for base and height
    A1 for answer
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    (Original post by Whittick)
    It was 100% 40 square units.


    Posted from TSR Mobile

    Would you get marks for mentioning the distance formula?
    What points did you get?
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    (Original post by Kadak)
    Posted from TSR Mobile

    How are you sure it was 40 square units :hmmm:.Everyone seems to have different answers for that question.
    It definitely is. If you scroll back there are many people who have proved why popular answers such as 50 and 20root5 are wrong.
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    (Original post by Kadak)
    Posted from TSR Mobile

    Would you get marks for mentioning the distance formula?
    What points did you get?
    I'm not sure but if you got the correct lengths of the 3 sides then I would have thought so...

    And I substituted y=0 into the equation of the circle and the tangent, then did 3 lots of the distance formula and a simple half base-height to get 40 units square haha
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    Tbh sorry no dont remember any.. Reckon high boundaries as it wasnt too hard
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    (Original post by Madhutty)
    It definitely is. If you scroll back there are many people who have proved why popular answers such as 50 and 20root5 are wrong.


    Posted from TSR Mobile

    Ah damn.I hope I pick at least 1 marl from that question.I need to get a high A in this C1 exam .
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    (Original post by gabby07)
    It was only 4 marks.

    I would say M1, 2 for the points, since this was the main brief of the question.
    M3 for base and height
    A1 for answer
    Oh, ok sorry. Yeah; you're quite right then.
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    (Original post by chloe-jessica)
    From this, expand the right to get:
    xlog7 = xlog2 + log2

    Collect like terms:
    xlog7 - xlog2 = log2

    Factorise:
    x (log7 - log2) = log 2

    Use log rule with subtracting -> dividing:
    x (log(7/2)) = log 2

    Divide:
    x = log2 / log(7/2)

    Hope that helped
    Thank you!
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    (Original post by Kadak)
    Posted from TSR Mobile

    Ah damn.I hope I pick at least 1 marl from that question.I need to get a high A in this C1 exam .
    Are you resitting then?

    Also if those are the only marks you dropped then 69/72 is almost definitely 90UMS at least.
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    (Original post by Whittick)
    It was 100% 40 square units.
    Yeah it was I got it wrong though 😒
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    (Original post by Madhutty)
    xlog7 = (x + 1)log2
    (log7)/(log2) = (x + 1)/x
    (log7)/(log2) = 1 + 1/x
    (log7)/(log2) - 1 = 1/x
    x = 1/((log7)/log2) - 1)

    Probably wrong... It's been a long year since I did any C2.
    I'm pretty sure there's a (Not MEI) OCR C2 post somewhere on TSR for you
    Thanks
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    (Original post by Madhutty)
    Oh, ok sorry. Yeah; you're quite right then.
    Haha! No fault of yours!! I find it incredible how people remember everything about the exam paper
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    (Original post by Madhutty)
    Are you resitting then?

    Also if those are the only marks you dropped then 69/72 is almost definitely 90UMS at least.


    Posted from TSR Mobile

    Nah,I think I got wrong answer for k and forgot to mention stretch for the graph.
    Apart from that,I pretty sure I got full marks on everything else.
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    (Original post by Madhutty)
    Oh, ok sorry. Yeah; you're quite right then.
    it was actually 3 marks
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    for question 8iii i worked it out 2 ways and got two different answers - one of which was correct. What will they do about that will they give me any marks at all?
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    (Original post by Kadak)
    Posted from TSR Mobile

    Nah,I think I got wrong answer for k and forgot to mention stretch for the graph.
    Apart from that,I pretty sure I got full marks on everything else.


    Posted from TSR Mobile
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    I wrote 40 but no units squared would i lose marks
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    (Original post by Kadak)
    Posted from TSR Mobile

    Nah,I think I got wrong answer for k and forgot to mention stretch for the graph.
    Apart from that,I pretty sure I got full marks on everything else.
    Did you get the scale factor (1/3) ? If so then that's probably going to be a mid-low A
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    Is there an unofficial markschem
 
 
 
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