Mr M's OCR (not OCR MEI) Core 2 Answers May 2016 Watch

NotGambit
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#141
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For the last question, i used the CAST diagram with 60 degrees and i got the same answers but in degrees rather than radians. How many marks will i lose?
Also, for 5bi, i got the answer but i ended up writing 4a^2 + 6a -2, would i lose any marks for doing that?
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Jusst Haris
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Hi

For question 3ii) How do you know what the constant was? I used 3, but i know now that it's wrong, can you show the method please.

If i left 9iii) as

x = (1/3π)/a

And

x = (4/3π)/a

would i still get full marks?

Thanks
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Mr M
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#143
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(Original post by NotGambit)
For the last question, i used the CAST diagram with 60 degrees and i got the same answers but in degrees rather than radians. How many marks will i lose?
Also, for 5bi, i got the answer but i ended up writing 4a^2 + 6a -2, would i lose any marks for doing that?
Last question - you might only lose 1.

5bi. They *might* ignore subsequent working or you might lose some marks - I can't say really.
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Mr M
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(Original post by Jusst Haris)
Hi

For question 3ii) How do you know what the constant was? I used 3, but i know now that it's wrong, can you show the method please.

If i left 9iii) as

x = (1/3π)/a

And

x = (4/3π)/a

would i still get full marks?

Thanks
The constant was given in part i) as part of the expansion.

You will probably get full marks on the last question.
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Buymoria
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(Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers May 2016

8.
(ii) Stretch parallel to the y axis scale factor \displaystyle \frac{1}{9} (2 marks)
How many marks would I lose for putting stretch parallel to the x axis scale factor 1/9?
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Mr M
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(Original post by Buymoria)
How many marks would I lose for putting stretch parallel to the x axis scale factor 1/9?
Drop 1.
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Mr M
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(Original post by grepole121)
For 8ii) I wrote stretch parallel to the x-axis by scale factor x/(x-2) will this get any marks because it produces the same graph or does it have to be in terms of numbers only and no variables?
Numbers are required.
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JamesK3000
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Hi Sir,
If I used my answer for a from part ii in part iii but did the question with the correct method, how many marks would I get?
Thanks
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Mr M
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(Original post by JamesK3000)
Hi Sir,
If I used my answer for a from part ii in part iii but did the question with the correct method, how many marks would I get?
Thanks
Question number? You need to give me a bit more to go on.
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JamesK3000
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(Original post by Mr M)
Question number? You need to give me a bit more to go on.
Oh yeah sorry, it was for Q9, part iii
I used a as 5/3 for part iii when it said it was a different value
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Bobyhowars
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(Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers May 2016


1. (i) 10 cm (2 marks)

(ii) 5.04 cm (2 marks)


2. (i) \displaystyle \frac{3 \pi}{10} (2 marks)

(ii) r=20.4 (3 marks)


3. (i) \displaystyle 27 +27kx+9k^2x^2 +k^3x^3 (4 marks)

(ii) k=\pm \sqrt{3} (2 marks)


4. (i) \displaystyle \log_3 \frac{x^2}{x+4} (2 marks)

(ii) x = 12 (4 marks)


5. (a) \displaystyle \frac{x^4}{2} -x^3 +2x^2-6x+k (3 marks)

(b) (i) \displaystyle \frac{2}{a^2} - \frac{6}{a} + 4 (4 marks)

(ii) 4 (1 mark)


6. (i) k=91 (3 marks)

(ii) \displaystyle S_{16} = 978 (2 marks)

(iii) N=38 (6 marks)


7. (i) Quotient x^2-4x+3 and remainder 0 (3 marks)

(ii) x=1 or x=-1 or x=3 (3 marks)

(iii) Show (2 marks)

(iv) \displaystyle \frac{512}{15} (4 marks)


8. (i) Translation by 2 units in the positive x direction (2 marks)

(ii) Stretch parallel to the y axis scale factor \displaystyle \frac{1}{9} (2 marks)

(iii) Sketch showing (0, \frac{1}{9}) as the only point of intersection (2 marks)

(iv) x=6.73 (3 marks)

(v) 9.60 (3 marks)


9. (i) \displaystyle \frac{2 \pi}{a} (1 mark)

(ii) \displaystyle a=\frac{5}{3} and \displaystyle k=\frac{\sqrt{3}}{2} (3 marks)

(iii) \displaystyle x=\frac{\pi}{3a} and \displaystyle x=\frac{4 \pi}{3a} (4 marks)


Sorry guys I made a mess of 9(ii) at the start - I didn't notice k had to be positive. It's right now.
For 9iii when dividing by cosax does cosax=0 not become a solution
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Mr M
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#152
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(Original post by JamesK3000)
Oh yeah sorry, it was for Q9, part iii
I used a as 5/3 for part iii when it said it was a different value
You might still get 2 marks in the final part.
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JamesK3000
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(Original post by Mr M)
You might still get 2 marks in the final part.
Okay thank you
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Mr M
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#154
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(Original post by Bobyhowars)
For 9iii when dividing by cosax does cosax=0 not become a solution
No.
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Bobyhowars
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(Original post by Mr M)
No.
Can you tell me why please
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Annonomous09
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(Original post by Mr M)
It isn't a correct answer. There is a scale factor of 1/9 in 8ii.
Okay thank you, I did get 1/9 as the scale factor. Also, for question 5bi), I wrote -6/a + 2/a +4. Does it matter which order the terms go?
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lulabellead
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Hi, for q6 part iii I went wrong in the method somewhere and got the wrong answer, but I realised and still wrote N=38. How many marks would I get? Also for the equating coefficient question I used k as the coefficient and somehow got +/- root 1/9. Would I get any marks?
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Kantth
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For 9 (ii) dont even know what i did but ended up gettin a=0 and when i subbed a into another equation it gave me k=0 would i even get a mark for writing k=0 or will they ignore it?
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swagmister
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Anyone want to have a stab at the grade boundaries? I made many silly mistakes on this paper :/
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Mr M
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(Original post by Bobyhowars)
Can you tell me why please
Because if is true then 1 = \sqrt 3
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