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OCR Core 2 - 22nd May

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    i hated this paper!

    i did like some of the working out of the logarithms and then got stuck! so i hope i can get like a few method marks there!

    i missed out a question by accident on how many roots because i was rushing

    i thought this would be easy and i was prepared i hope they lower the grade boundries and i scrape an A
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    (Original post by Ejit)


    And was there only one real root for the cubic equation, because the discriminant for the quadratic was negative?

    Also, can you have a remainder of -10???

    oh and for the second trig q. i put 30 and 150 , i'm an idiot.
    as far as i can remember 30 and 150 (2nd trig question) was what i got along with 90
    and im sure there right.
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    Unbelieveably hard! I hated questions 2,3,5ii
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    (Original post by luke_1992)
    Unbelieveably hard! I hated questions 2,3,5ii
    i did then i started over and did them nicely
    perseverance is the key to hard maths exams
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    (Original post by amysz)
    oh no my bad i did halve them!! so it was 15 and 75 right?
    i SO almost forgot to do it in the exam :|
    yes you had to half them as it was sin2x so it was 15 and 75
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    (Original post by Andylol)
    For the Trapezium question, I got sqrt k as 3 or 5, so k must be 9 or 25. But when I subbed it into the equation it only worked for 9 and not 25, so it had to be 9

    Also, that 3rd question was solid (7^x = 2^{x+1})! I used so many methods to work it out but still got x as 1.81 - which is completely wrong, that was some shizz!
    Stumped me for a while but this is how i did it.

    xlog7=x+1log2
    xlog(2^2.8)=x+1log2
    2.8xlog2=x+1log2

    2.8x=x+1
    1.8x=1
    x=0.555 ~ or there abouts.

    Last question I did the psuedo quadratic making k=k^2 when it should have been k^0.5 therefore after doing it at home k=9

    formula for k is 1+k+2k^0.5

    duh

    Only one I got wrong.

    Equation of line was x^3+2x+5=y If i remember correctly. Checked for both co ordinates it worked. (-1,2)(2,17) try it.

    32 was perimeter.

    Never went above 150cm^2

    Angle was 114.5 if i can remember.

    Remainder was -10





    the 8 marker took me for ever but I got it. I think I will have 90+%

    Most of mine agree with here
    http://www.thestudentroom.co.uk/showthread.php?t=913533
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    I'm not going to worry myself by waiting on here any longer.

    I got the logs question where you had to show something x = 2 + log(5) k or something wrong. But its still possible that the others are all right. I'll wait til Mr M comes on
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    (Original post by elliot22)
    I'm not going to worry myself by waiting on here any longer.

    I got the logs question where you had to show something x = 2 + log(5) k or something wrong. But its still possible that the others are all right. I'll wait til Mr M comes on
    The answers are already up on the Maths Exams sub-forum.
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    (Original post by raj_mostwanted)
    guys i did like every single pastpaper for this CORE 2 but i think it was the hardest paper ,,,, does any1 think that grade bounderies should become lower for this paper i knw i lost abt 18 marks garunteeed
    I agree, it was easily the hardest C2 paper I've solved.
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    (Original post by definite_maybe)
    I got something like 2750.
    I got 2750. Then I wasn't sure so I added it up the long way and it still came to 2750.
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    ((( for question 6 i misread the question as dy/dx = 2x^2+a (instead of 3x^2 +a)
    so integrated that and found a and c values arghhhh i feel so stupid!
    how many of the 8 marks (if any) will i get ???
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    This was my 3rd attempt at the C2 exam and this one was the hardest by miles, what a farce! :mad:
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    I really need your help and advice guys and MR M!!

    Basically, in that paper for question 2)i) were we had to find the value of "a" and "c", instead of me writing the correct equation which was "a+9d=2(a+3d) I put "2(a+9d)=a+3d" then from there I went on to get a different value for "a" and "c". I didn't really feel that i made mistake at that time because even though using that equation I got sensible whole number answers. So my question is as follows.. Will I get any marks at all??, The problem is that I got the concept right but the wrong way round

    The major problem now is that then i went on to answer the other part of question 2 [2)ii)] using the values of "a" and "c" that i worked out earlier. So again i got the concept perfectly right but ended with a wrong answer because i got the wrong numbers in the previous question. So again for this part of the question, would i get any marks at all???

    Thanks to all in advance
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    (Original post by Andylol)
    Can someone go through how they did 7^x = 2^{x+1}

    That was the only question on the paper that I was totally stuck on, not a clue! Got x to be 1.81 ¬_¬
    ooooh i really liked that question actually i'll have another go at it now-

    7^x = 2 * 2^x



log7^x = log (2 * 2^x)



xlog7= log2 + xlog2



xlog7 - xlog2 = log2



x(log7 - log2) = log2



x = log2/(log7 - log2)
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    Mr M, what are usually the grade boundaries for a grade A in C2, and you personally do you think that they will be lowered this year??
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    (Original post by The_wise)
    Mr M, what are usually the grade boundaries for a grade A in C2, and you personally do you think that they will be lowered this year??
    Hi I replied to this question in the other thread.

    For anyone who is looking I posted the answers in the other thread.

    You might want to let this one drop down the list and use the other one.
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    (Original post by ssj786)
    as far as i can remember 30 and 150 (2nd trig question) was what i got along with 90
    and im sure there right.
    Wrong, you forgot to half them

    Was quite a hard paper, but nothing out of the ordinary was asked
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    Even the C1 which was done was a tough one compared to all the past papers.

    I heard in the news that since exams are getting easier now they started to make them harder.

    the summation question in the C2 paper was 1270 or somewhere around that.

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Updated: May 22, 2009
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