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Mr M's OCR (not OCR MEI) Core 2 Answers May 2012 <strong><font

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    for questio 7 if you got the right answer but didnt use the method which will probably be on the markscheme ( the traingle one) would you still get the marks? i ended up using sin^2 +cos ^2 =1 and then devided by cos^2 and did a whole bunch of other stuff :/
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    What was question 7 about? and did it require your calculator to be in degrees mode?
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    Mr M, on question 7ai) I left it as 5/root29. Would I loose a mark for not writing it in standard form?
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    (Original post by Andy16)
    What was question 7 about? and did it require your calculator to be in degrees mode?
    its was tana =2/5 find sina or could have been cosa i cant remember exactly
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    For question 7 I put the answer in decimal form, correct to three significant figures. Would that mean that I get no marks?
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    (Original post by Mr M)
    periodic/repeating is fine
    What about reoccuring sequence of o.5 and 4, thats what I put would I get "reoccuring"


    also for 0.5<x<2 would I have got any marks for x>2 because i calculated that it needed 2 correctly but did put it the right way around
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    What was the technique for doing question 7 part A?
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    If for question 1)ii) i got the sign between the two expansions wrong so i got all the wrong terms, will i lose both marks or only one??
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    (Original post by Mr M)
    Mr M's OCR (not OCR MEI) Core 2 Answers May 2012


    1. (i) 243+810x+1080x^2+720x^3+240x^4+3  2x^5 (4 marks)

    (ii) 486+2160x^2+480x^4 (2 marks)


    2. (i) \frac{x^3}{3}-x^2+5x+k (3 marks)

    (ii) y=\frac{x^3}{3}-x^2+5x-4 (3 marks)


    3. (i) \frac{2\pi}{5} (1 mark)

    (ii) r = 15 (2 marks)

    (iii) 34.4 (3 marks)


    4. x = 48.6, 131, 90 degs (6 marks)


    5. (a) (i) u_2 =\frac{1}{2} and u_3 = 4 (2 marks)

    (ii) Cycles periodically between 4 and 1/2 (1 mark)

    (b) a = -2 and d = 2.5 (5 marks)


    6. (i) Show trapezium rule (3 mark)

    (ii) Sketch graph showing trapeziums under the curve (2 marks)

    (iii) \frac{208}{3} (4 marks)


    7. (a) (i) \frac{5 \sqrt{29}}{29} (2 marks)

    (ii) \frac{-2\sqrt{10}}{7} (3 marks)

    (b) \frac{3\sqrt{3}}{8} (3 marks)


    8. (i) Show a = -4 and obtain b = 3 (6 marks)

    (ii) f(x)=(x-1)(x-2)(x+3)

    g(x) also has (x+3) as a common factor (5 marks)


    9. (a) (i) Show fourth term (3 marks)

    (ii) x=\frac{4}{3} (2 marks)

    (b) (i) \frac{1}{2}&lt;y&lt;2 (2 marks)

    (ii) y=\frac{2}{3} (5 marks)
    Hi Mr M,

    For the question that asked us to find the values of y for which the GP was valid, I put the modulus of y is less than something...I can't remember exactly what the number was but is there a correct version of the answer involving a modulus sign?

    Thanks!
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    (Original post by joemkcarr)
    What was the technique for doing question 7 part A?
    i think you had to realise that bcause tana =sina/cos a then if you drew out a trinagle the bottom length would be 5 the other would be 2 and so the hypotenuse would be squareroot 29 ( pythagoras) so then sin would be the bottom legth 5 over the hypotenuse so the answer is 5/square root 29
    then u can rationalise the denominator but i dont think you had to :/

    im really annoyed i didnt spot that in the exam :/
  11. Offline

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    How did you do questions 7 and 9.
    I have *compleltely* different versions.. and i've super messed this up :/
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    [QUOTE=Mr M;37613431]Mr M's OCR (not OCR MEI) Core 2 Answers May 2012

    7. (a) (i) \frac{5 \sqrt{29}}{29} (2 marks)

    (ii) \frac{-2\sqrt{10}}{7} (3 marks)



    Hi Mr M

    Thank again for the mark scheme!
    I got
    7ai) 5 divided by root 29
    ii) 2 root 10 divided by 7 (no minus)

    So so you know if these will be marked correct?

    Thanks again
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    (Original post by Mr M)
    Mr M's OCR (not OCR MEI) Core 2 Answers May 2012


    6.(iii) \frac{208}{3} (4 marks)

    Mr M
    did qu 6iii) have to be an exact value? I wrote \frac{208}{3} BUT then wrote the decimal version next to it and underlined it do you think I'd get the mark??
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    (Original post by 777edr777)
    Mr M did qu 6iii) have to be an exact value? I wrote 208/3 BUT then wrote the decimal version next to it and underlined it do you think I'd get the mark??
    Same. I got the decimal version. Doubt it matters x
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    [QUOTE=Chocoholic1994Asks;3761634 8]
    (Original post by Mr M)
    Mr M's OCR (not OCR MEI) Core 2 Answers May 2012

    7. (a) (i) \frac{5 \sqrt{29}}{29} (2 marks)

    (ii) \frac{-2\sqrt{10}}{7} (3 marks)



    Hi Mr M

    Thank again for the mark scheme!
    I got
    7ai) 5 divided by root 29
    ii) 2 root 10 divided by 7 (no minus)

    So so you know if these will be marked correct?

    Thanks again
    About 7ii)
    after the exam someone told me you need to make it minus because it wanted to obtuse angle.

    I got what you got but then went and did 1-my answer to try and get the obtuse angle :/
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    Grade boundaries?? Anyone
  17. Offline

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    For the ratio one, will 0<y<2 get 1 mark?

    also what do you think the marks for 100ums would be?
  18. Offline

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    (Original post by Mr M)
    Mr M's OCR (not OCR MEI) Core 2 Answers May 2012


    1. (i) 243+810x+1080x^2+720x^3+240x^4+3  2x^5 (4 marks)

    (ii) 486+2160x^2+480x^4 (2 marks)


    2. (i) \frac{x^3}{3}-x^2+5x+k (3 marks)

    (ii) y=\frac{x^3}{3}-x^2+5x-4 (3 marks)


    3. (i) \frac{2\pi}{5} (1 mark)

    (ii) r = 15 (2 marks)

    (iii) 34.4 (3 marks)


    4. x = 48.6, 131, 90 degs (6 marks)


    5. (a) (i) u_2 =\frac{1}{2} and u_3 = 4 (2 marks)

    (ii) Cycles periodically between 4 and 1/2 (1 mark)

    (b) a = -2 and d = 2.5 (5 marks)


    6. (i) Show trapezium rule (3 mark)

    (ii) Sketch graph showing trapeziums under the curve (2 marks)

    (iii) \frac{208}{3} (4 marks)


    7. (a) (i) \frac{5 \sqrt{29}}{29} (2 marks)

    (ii) \frac{-2\sqrt{10}}{7} (3 marks)

    (b) \frac{3\sqrt{3}}{8} (3 marks)


    8. (i) Show a = -4 and obtain b = 3 (6 marks)

    (ii) f(x)=(x-1)(x-2)(x+3)

    g(x) also has (x+3) as a common factor (5 marks)


    9. (a) (i) Show fourth term (3 marks)

    (ii) x=\frac{4}{3} (2 marks)

    (b) (i) \frac{1}{2}&lt;y&lt;2 (2 marks)

    (ii) y=\frac{2}{3} (5 marks)
    MR M PLEASE HELP. for question three i STUPIDLY did not read the pie after 45, but all the rest of my working was correct. So how many marks will i lose for question three? Also for question 7 I left my answers unsimplified but they were correct, so do i loose marks? THANKS
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    Thought i done well but lookin at the answers got a c/b lol
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    (Original post by max25)
    MR M PLEASE HELP. for question three i STUPIDLY did not read the pie after 45, but all the rest of my working was correct. So how many marks will i lose for question three? Also for question 7 I left my answers unsimplified but they were correct, so do i loose marks? THANKS
    damn i did the exact same.
    For q3 i didn't read the pi part which means i got 3ii wrong too.
    q7 also, I did all of my answers in decimal form instead of surd form.
    I think mr m has stopped responding, so i guess we'll all have to wait till august

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Updated: May 25, 2012
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