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Mr M's OCR Core 1 (not OCR MEI) May 2016 Answers

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    (Original post by blinin7)
    Hi, would appreciate some help.

    For question 6 i) I got
    2(x+3)-22
    instead of,

    as for some reason I re-arranged the equation given so that it began with 2x^2...

    Question 7 iii)
    I put stretch of scale factor 2 in x direction instead of Stretch parallel to the y axis scale factor 0.5

    Question 9
    I got k>5 and K<-4
    instead of
    or
    however i got the factors (2k-10) (2k+4), I was just so rushed i put K as -4 instead of K as -2

    Any ideas how many Marks I would have dropped from those 3.

    Many thanks
    6) drop 1

    7iii) drop 1

    9) drop 2
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    (Original post by Nomes24)
    Thanks for your reply! I thought the second tangent met the circle (according to the diagram) at the y intercept, I know that isn't the most mathematical way to do it but I was desperate, which is why I think I might have lost marks. I got the gradient as 2 and (0,10) then did y-10=2(x-0) to get y=2x+10?

    I found the y intercept by setting x to zero and then factorising.
    The tangent doesn't meet the circle at (0,10) unfortunately.
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    (Original post by Mr M)
    The tangent doesn't meet the circle at (0,10) unfortunately.
    Thanks, I'm really confused as to what I did then but thanks anyways!! (Think I just got lucky lol but one mark for gradient is fine)
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    Anyone know what the first question was?
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    (Original post by Mrrexxxx)
    Anyone know what the first question was?
    Simplify (2x-3)^2-2(3-x)^2.
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    (Original post by Mr M)
    Simplify (2x-3)^2-2(3-x)^2.
    Was the OCR C1 any harder than usual?
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    (Original post by Mr M)
    This was definitely the most difficult Core 1 ever.
    Wow, it really must have been hard! I didn't do the exam (I'm an A2 student) but there was lots of complaining at college this morning.
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    (Original post by TeeEm)
    Was the OCR C1 any harder than usual?
    Yes a bit. Welcome back by the way.

    Was Edexcel C1 noticeably harder than usual? I've just declined a request from a journalist to comment about it!
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    (Original post by Mr M)
    Yes a bit. Welcome back by the way.

    Was Edexcel C1 noticeably harder than usual? I've just declined a request from a journalist to comment about it!
    Concept-wise no.
    Just ugly numbers which upset/slowed down some students.
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    (Original post by marioman)
    Wow, it really must have been hard! I didn't do the exam (I'm an A2 student) but there was lots of complaining at college this morning.
    Some of my stronger students were grumbling but I usually don't take a lot of notice as, in my experience, students often say this was the hardest paper ever. In this case, I think they had something to grumble about. I don't usually engage my brain at all to complete Core 1 but two or three times I had to stop to think on this paper.
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    http://imgur.com/pNskLz6This was my working for q11. I know that everything past where I introduce alpha is completely wrong, just was wondering roughly how much I will get credited for the first chunk of my answer. Thanks a million
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    (Original post by finn.thehuman)
    http://imgur.com/pNskLz6This was my working for q11. I know that everything past where I introduce alpha is completely wrong, just was wondering roughly how much I will get credited for the first chunk of my answer. Thanks a million
    I don't know where the marks will be awarded but that is worth at least 4.
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    For 7(ii) I believe the equation of the curve was y = x(3x-x^2) or y = 3x^2 -x^3

    And the question was a translation by 2 units parallel to the x axis

    So can you just put 3(x-2)^2 - (x-2)^3 ?

    There was hardly any space for multiplying that out so I don't see how you could put (5-x)(x-2)^2 ???
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    (Original post by Ana246)
    For 7(ii) I believe the equation of the curve was y = x(3x-x^2) or y = 3x^2 -x^3

    And the question was a translation by 2 units parallel to the x axis

    So can you just put 3(x-2)^2 - (x-2)^3 ?

    There was hardly any space for multiplying that out so I don't see how you could put (5-x)(x-2)^2 ???
    That's the same thing - full marks.

    And you wouldn't multiply out anyway. Factorisation is your friend.
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    For 7i when drawing the graph was it okay to just draw a line from the origin along the x axis to the point (0,3) or was there a need to show the maximum point.
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    Does anyone remember what the q 8iii was. I'm not sure if I got it right or not
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    (Original post by Devkj)
    For 7i when drawing the graph was it okay to just draw a line from the origin along the x axis to the point (0,3) or was there a need to show the maximum point.
    You needed to show the shape of a maximum between (0, 0) and (0, 3).
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    Would i only drop one mark for not showing that.
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    (Original post by Laura122334)
    Does anyone remember what the q 8iii was. I'm not sure if I got it right or not
    The normal at A meets the y axis at C. Find the y coordinate of C.
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    (Original post by Devkj)
    Would i only drop one mark for not showing that.
    Yes.
 
 
 
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