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    Hi, I'm getting quite worried about question 7, as I know perfectly well how to find the equation of a line but have a feeling I rushed it and messed up...

    Was the x intercept for the tangent (3,0)?
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    (Original post by Mr M)
    You're wrong. The cute writing won me over.
    You legend
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    hello I was just wondering if you had the questions for this paper?
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    I don't know if anyone is still on this page, but i would really appreciate it if you could explain the method for 4i? I got set this for homework and I'm completely stuck! (what topic does it even come under?)
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    (Original post by izzyft)
    I don't know if anyone is still on this page, but i would really appreciate it if you could explain the method for 4i? I got set this for homework and I'm completely stuck! (what topic does it even come under?)
    From looking at the answers, I assume that it is completing the square.
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    (Original post by tiny hobbit)
    From looking at the answers, I assume that it is completing the square.
    yes i realised that after posting this!
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    Mr. M will you be uploading the edexcel core 1 19/05/14 paper answers?
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    Mr M, will you be doing a M2 (not MEI) mark scheme? Thank you
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    (Original post by User153)
    Mr. M will you be uploading the edexcel core 1 19/05/14 paper answers?
    Arsey might upload edexcel Mr M does the ocr syllabus


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    (Original post by Mr M)
    Mr M's OCR (not OCR MEI) Core 1 Answers May 20139


    1. (i) 12 \sqrt 5 (2 marks)

    (ii) 4 \sqrt 5 (1 mark)

    (iii) 5 \sqrt 5 (1 mark)


    2. x=\frac{1}{2} or x=-1 (5 marks)


    3. (i) f'(x)=2-\frac{12}{x^3} (3 marks)

    (ii) f''(x)=\frac{36}{x^4} (2 marks)


    4. (i) 3(x+\frac{3}{2})^2+\frac{13}{4} (3 marks)

    (ii) (-\frac{3}{2}, \frac{13}{4}) (3 marks)

    (iii) -39 (2 marks)


    5. (i) Correct sketch (2 marks)

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

    (iii) Stretch scale factor \frac{1}{2} parallel to y axis (2 marks)


    6. (i) Centre (0, -4) and radius 2 \sqrt{10} (3 marks)

    (ii) (-2, -10) (2 marks)


    7. (i) x<-\frac{1}{8} (2 marks)

    (ii) 0 \leq x \leq 5 (5 marks)


    8. 6x+2y-1=0 (7 marks)


    9. (i) Correct sketch with intersections at (-1.5, 0) and (2, 0) and (0, -6) (5 marks)

    (ii) x \leq \frac{1}{4} OR x < \frac{1}{4} (either will be marked correct) (3 marks)

    (iii) 4.5 (4 marks)


    10. (i) k=-5 (7 marks)

    (ii) Minimum (2 marks)

    (iii) (-2, -27) (5 marks)


    I'll be around to answer questions shortly.

    Please do a c1 2014 june thread
    everyone is need of answers hahaha
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    (Original post by Ferrari94)
    Please do a c1 2014 june thread
    everyone is need of answers hahaha
    Exam board rules mean that papers are not released to teachers for 24 hours.
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    (Original post by Mr M)
    Exam board rules mean that papers are not released to teachers for 24 hours.
    Ok thanks for the heads up

    Did your students find it a nice exam ?
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    (Original post by Ferrari94)
    Ok thanks for the heads up

    Did your students find it a nice exam ?
    Yes they found it easy.
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    (Original post by Mr M)
    Certain to confuse as f(x) did not equal 1/x^2.
    which is why I stated IF f(x) = . . .

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    (Original post by Mr M)
    Yes they found it easy.
    Hi Mr M, I used a non-HB pencil for my graph. Will that be a problem?
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    (Original post by shaseb)
    Hi Mr M, I used a non-HB pencil for my graph. Will that be a problem?
    No.
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    (Original post by Mr M)
    No.
    Thank you SO much, I was freaking out thinking that the scanner wouldn't read it because I used a regular pencil instead of a HB one.

    Do you think a 66 would get an A in this paper or would the grade boundaries be ridiculous because it was a pretty easy paper?
 
 
 
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