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Mr M's OCR (not OCR MEI) Core 1 Answers May 2015

Mr M's OCR (not OCR MEI) Core 1 Answers May 2015


1. 43+44\sqrt3+4 (3 marks)


2. (i) Curve in second and fourth quadrants (2 marks)

(ii) y=12−xy=\frac{1}{2-x} (2 marks)

(iii) Stretch parallel to y axis (or x axis) scale factor 13\frac{1}{3} (2 marks)


3. (i) 585^8 (1 mark)

(ii) 5−145^{-\frac{1}{4}} (2 marks)

(iii) 5925^{\frac{9}{2}} (2 marks)


4. x=27x=27 or x=−8x=-8 (5 marks)


5. (i) 5 (2 marks)

(ii) 6x−8y−29=06x-8y-29=0 (7 marks)


6. x=2x=2 and y=1y=1 or x=143x=\frac{14}{3} and y=−133y=-\frac{13}{3} (5 marks)


7. (a) −3x2+10x−3-3x^2+10x-3 (4 marks)

(b) −148-\frac{1}{48} (4 marks)


8. (i) U shaped parabola passing through (−1,0)(-1, 0), (0,−3)(0, -3) and (32,0)(\frac{3}{2}, 0) (4 marks)

(ii) x<−1x<-1 or x>32x>\frac{3}{2} (2 marks)

(iii) k<−258k<-\frac{25}{8} (3 marks)


9. (i) a=13a=13 (5 marks)

(ii) Minimum (2 marks)

(iii) x=13x=\frac{1}{3} (3 marks)


10. (i) Centre (5,−2)(5, -2) and radius 5 (3 marks)

(ii) Show ... (5 marks)

(iii) 40 square units (4 marks)

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Reply 1
Avatar for ccfctom
ccfctom
1
for 8iii) i wrote b^2 - 4ac< 0 , then worked it out but put k >25 instead of the other way round k<-25.

How many marks do you expect me to get from that?
Original post by ccfctom
for 8iii) i wrote b^2 - 4ac< 0 , then worked it out but put k >25 instead of the other way round k<-25.

How many marks do you expect me to get from that?


1 mark for using the discriminant.
Reply 3
Avatar for Parallex
Parallex
6
thanks for this! ^^

edit: any chance you're doing OCR FP1?
Reply 4
Avatar for AlfieH
AlfieH
2
Isn't 2ii incorrect? :colondollar:
Reply 5
Avatar for higgin97
higgin97
I left 2ii) as -1/(x-2) do you think I'll lose a mark for this?
Ahh okay I'm sure I achieved 60-63 hmm, I wonder what the boundary for an A will be! What do you believe in your opinion? (And thankyou!)
Original post by AlfieH
Isn't 2ii incorrect? :colondollar:


over (x-2) is it?
Reply 8
Avatar for AlfieH
AlfieH
2
Original post by jackpethick
over (x-2) is it?


The original curve was -1/x therefore if it was a translation +2 units in the x direction the new equation would be -1/x-2?
Original post by higgin97
I left 2ii) as -1/(x-2) do you think I'll lose a mark for this?


No.
Original post by AlfieH
Isn't 2ii incorrect? :colondollar:


No.

You have probably written y=−1x−2y=-\frac{1}{x-2}. This is exactly the same.
Original post by AlfieH
The original curve was -1/x therefore if it was a translation +2 units in the x direction the new equation would be -1/x-2?


That's the same as the answer. Multiply numerator and denominator by -1.
Original post by nobodycarescarla
Ahh okay I'm sure I achieved 60-63 hmm, I wonder what the boundary for an A will be! What do you believe in your opinion? (And thankyou!)


I've no idea and I don't like to guess. We'll just have to wait and see.
Original post by Mr M
No.

You have probably written y=−1x−2y=-\frac{1}{x-2}. This is exactly the same.


Ahh that makes sense, it's hard to remember what exactly i got. Cheers.
Original post by Parallex
thanks for this! ^^

edit: any chance you're doing OCR FP1?


Tomorrow evening I will.
Reply 15
Avatar for Golem.
Golem.
4
Original post by Mr M
No.


Hi, are you doing any answers for the AQA C1 maths? Would be reeeeaaallly appreciated if so :smile:)
Original post by Golem.
Hi, are you doing any answers for the AQA C1 maths? Would be reeeeaaallly appreciated if so :smile:)


I only do OCR for A Level. Sorry.
Reply 17
Avatar for AlfieH
AlfieH
2
Original post by Mr M
That's the same as the answer. Multiply numerator and denominator by -1.


I was misled then by google graphs since entering y=1/ 2-x gives a straight line graph.

Screen Shot 2015-05-14 at 18.54.53.png

EDIT: Forgot the brackets! Sorry for being a goon. Cheers!
(edited 8 years ago)
Original post by Mr M
Tomorrow evening I will.


Thanks. :smile:
Reply 19
Avatar for ajamesg
ajamesg
1
Is there any chance you could post the c1 paper?

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