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Mr M's OCR (not OCR MEI) Core 1 answers January 2012

Mr M's OCR (not OCR MEI) Core 1 answers January 2012

1.

8+3\sqrt{3}

(4 marks)

2. (i) Reflection in y axis (2 marks)

(ii) Translation by 2 units in positive y direction (2 marks)

3. p=-10, q=5, r=-13 (4 marks)

4. (i)

\frac{1}{9}

(1 mark)

(ii) 8 (2 marks)

(iii) 5 (2 marks)

5. -1/2 and 1/2 (5 marks)

6. (i)

-4x^{-2} -3

(3 marks)

(ii) 64 (4 marks)

7 (i) (1, 9) and justify minimum (8 marks)

(ii) -11 (2 marks)

(iii) Explanation (2 marks)

8 (-3, 17) and (9, -7) (6 marks)

9. (i) Sketch showing inverted parabola passing through (0, 12), (-4, 0) and (3, 0) (5 marks)

(ii)

-4<x<3

(2 marks)

(iii) (-2, 10) and (4, -8) (5 marks)

10 (i)

x^2+y^2+4x-8y-5 = 0

(3 marks)

(ii) Show tangent (5 marks)

(iii) Verify (1 mark)

(iv) 25 square units (4 marks)

Edit: I have amended 9ii) as it was incorrect.

(edited 12 years ago)

Scroll to see replies

2011?

Thank you so much

(edited 12 years ago)

Reply 3

Emissionspectra

looks like i didnt drop a mark :biggrin:

Reply 4

Mr M

Study Forum Helper

Original post by skibur

2011?

Hopefully that was the only mistake! Corrected.

Reply 5

Executioner

I lost Marks here:
(iii) 5 (2 marks) I wrote 5root10
7 (i) (1, 9) and justify minimum (8 marks) - I didn't get this :s-smilie:

now i'm stressing
(iii) Explanation (2 marks) - Thought I'd leave it out since it was only 2 marks
8 (-3, 17) and (9, -7) (6 marks) -Lost big marks here

Everything else was fine :smile:

(edited 12 years ago)

Reply 6

Emissionspectra

What do you think grade boundaries are likely to be

Reply 7

Mr M

Study Forum Helper

Original post by Emissionspectra

What do you think grade boundaries are likely to be

No idea sorry.

Reply 8

Emissionspectra

Original post by Mr M

No idea sorry.

No probs, would you say it was a particulalry challenging paper, i thought it was quite generous although question 8 required a bit of thinking (diagram FTW)

Reply 9

dyl1101

Can someone give a run through on how to answer q8 pls, want to check if I gained any method marks!

Reply 10

Mr M

Study Forum Helper

Original post by Emissionspectra

No probs, would you say it was a particulalry challenging paper, i thought it was quite generous although question 8 required a bit of thinking (diagram FTW)

It just seemed the same as usual to me.

Reply 11

Naami

How do you guys remember what you wrote for each question? I'm having trouble remember what I wrote for question 1 and whether or not I got it right.....

I know I DID NOT get marks for Q8 and 7(iii) - Did not have a clue how to answer.

Reply 12

Darth Log

Original post by Naami

I just scribble my answers down on a bit of paper :smile:

. Looks like I dropped 5 marks.

Anyway, cheers Mr M!

Reply 13

decy, the creator

Original post by Emissionspectra

looks like i didnt drop a mark :biggrin:

knobhead alert.

Reply 14

kellyfw123

anyone remember what question 1 was?

Also 9 (ii)

Reply 15

hannah1994

What was question 9iii? really can't remember!!

Reply 16

Mr M

Study Forum Helper

Original post by kellyfw123

anyone remember what question 1 was?

Also 9 (ii)

1) Simplify

\frac{15+\sqrt{3}}{3-\sqrt{3}}

9ii) Solve

12-x-x^2>0

Edit: Just noticed a mistake I made on 9ii) - now corrected.

Reply 17

kellyfw123

thanks, scared me there!

Reply 18

Mr M

Study Forum Helper

Original post by hannah1994

What was question 9iii? really can't remember!!

Find the coords of the points of intersection of

y=12-x-x^2

and

3x+y=4

Reply 19

kellyfw123

how many marks do you think you would get if on question 8, you got all the way to the simplified quadratic formula and then just screwed up finding the coordinates?
thanks