Mr M's OCR Core 1 (not OCR MEI) May 2016 Answers

I don't know where the marks will be awarded but that is worth at least 4.

It is possible for you to show questions. Much appreciated

what do you think the grade boundaries will be to get full UMS. I think I dropped 4 marks at max!

Mr M's OCR (not OCR MEI) Core 1 May 2016 Answers


1. (i) $2x^2-9$ (2 marks)

(ii) -10 (2 marks)


2. $-\frac{1}{4}+\frac{3\sqrt5}{4}$ (4 marks)


3. $x = -3$ and $y = -5$ or $x = \frac{3}{5}$ and $y = \frac{29}{5}$ (5 marks)


4. $y=\frac{1}{16}$ or $y=81$ (5 marks)


5. (i) $2^{-6}$ (2 marks)

(ii) $2^{\frac{13}{3}}$ (3 marks)


6. (i) $-2(x-3)^2 + 22$ (4 marks)

(ii) (3, 22) (2 marks)


7. (i) Negative cubic with the x axis as a tangent at (0, 0) and crossing the x axis at (3, 0) (3 marks)

(ii) $y=(x-2)^2(5-x)$ (2 marks)

(iii) Stretch parallel to the y axis scale factor 0.5 (2 marks)


8. (i) Show ... (3 marks)

(ii) The gradient at A is 20 and as h approaches 0 the gradient of the line also becomes 20 (1 mark)

(iii) $\frac{201}{4}$ (3 marks)


9. $k<-2$ or $k>5$ (7 marks)


10. (i) Centre (4, 3) Radius $3\sqrt{5}$ (3 marks)

(ii) $y=2x-20$ (6 marks)

(iii) $y=2x+10$ (3 marks)

(iv) $0<r<3\sqrt{5}-5$ (2 marks)


11. $a=27$ (8 marks)


This was definitely the most difficult Core 1 ever. I'll be around to discuss questions later for a bit. Post in the thread, don't private message me as the system is running very slow.

For question 9, I had B and C incorrectly positive/negative (cant remember) before I put into the discriminant.

This gave me k< -5 and k > 2

How many marks will I lose? I noticed at the very end and was gutted

How much marks would I get on the circles question (the first part) for using the coordinates of the centre of the circle instead of (10, 0) and getting an answer of y=2x-5?

Mr M's OCR (not OCR MEI) Core 1 May 2016 Answers


1. (i) $2x^2-9$ (2 marks)

For this I got something like 2x^2-12x+9 - 2x^2-12x+18. When simplified
And I got the answer to be just 9
Did we do the same question\ paper. as I'm 99.999% sure this is correct.