Mr M's OCR (not OCR MEI) Core 1 Answers May 2013

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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)?

Reply 381

waheed786

Original post by Mr M

You're wrong. The cute writing won me over.

You legend :smile:

Reply 382

missexams

hello I was just wondering if you had the questions for this paper?

Reply 383

username1155678

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?)

Reply 384

tiny hobbit

Original post by izzyft

From looking at the answers, I assume that it is completing the square.

Reply 385

username1155678

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! :colondollar:

Reply 386

User153

Mr. M will you be uploading the edexcel core 1 19/05/14 paper answers?

Reply 387

Beckseybabes

Mr M, will you be doing a M2 (not MEI) mark scheme? Thank you

Reply 388

Goods

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

Posted from TSR Mobile

Reply 389

Ferrari94

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}

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}

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

Reply 390

Mr M

Study Forum Helper

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.

Reply 391

Ferrari94

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 ?

Reply 392

Mr M

Study Forum Helper

Original post by Ferrari94

Ok thanks for the heads up

Did your students find it a nice exam ?

Yes they found it easy.

Reply 393

begbie68

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) = . . .

:smile:

Reply 394

shaseb

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? :frown:

Reply 395

Mr M

Study Forum Helper

Original post by shaseb

Hi Mr M, I used a non-HB pencil for my graph. Will that be a problem? :frown:

No.

Reply 396

shaseb

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?