You are Here: Home >< Maths

# OCR C2 exam Wed 25th May Watch

1. (Original post by SGHD26716)
x^ isn't negative, but x is. The original equation was 2logx something.
no i defo double checked it u couldnt have -3, i dont think it was 2log???
2. (Original post by rewre)
no i defo double checked it u couldnt have -3, i dont think it was 2log???
The first part of the question was to combine it into a single log

Then you had to solve that, but in the question it was expressed as two different logs. Putting in -3 into the calculator gives you a math error. So the only answer was 12
3. (Original post by SGHD26716)
x^ isn't negative, but x is. The original equation was 2logx something.
In the same way you'd get a math error with a power like 400, so you multiply the log by 400, you get a math error with a negative power, so you apply the log's multiplier as an indice to square it and remove the negative
4. (Original post by SGHD26716)
The first part of the question was to combine it into a single log

Then you had to solve that, but in the question it was expressed as two different logs. Putting in -3 into the calculator gives you a math error. So the only answer was 12
If you put -3 into the combined log ((-3)^2 / (-3+4)), you don't get a math error
5. (Original post by rewre)
Can someone plsss confirm , for the sum of U > sum of w , did u have to find a new first number and difference for the arithemetic because it was Un+1 it was just Un???

Also wasnt the period PIE/ A?
you could, if you wished have found the value of N with equality sign (this being critical value) and get something like 37.bla But 'is greater than' is asked for so rounding it up should give 38.
6. (Original post by h3rmit)
If you put -3 into the combined log ((-3)^2 / (-3+4)), you don't get a math error
im pretty sure it wasnt 2log anyway, i thought it was X-2 LOG ????????
Ive just remembered because i remember plussing 2 to the other side!
7. (Original post by h3rmit)
If you put -3 into the combined log ((-3)^2 / (-3+4)), you don't get a math error
What were the equation?
8. Yes this is right since 9x^2k^2=k
9. (Original post by tangotangopapa2)
you could, if you wished have found the value of N with equality sign (this being critical value) and get something like 37.bla But 'is greater than' is asked for so rounding it up should give 38.
so u couldnt use the first number and D u had already found for part i ? u had to find it again with 1 , 2, 3 not using previous answer? this gave you A= 2.5 and D= 1
10. I coudnt find the 2015 c2 paper so how hard was this compared that and if so what do you guys reckon the boundaries gonna be
11. What was answer to question 2 on perimeter of sector my mind went blank 😞
12. (Original post by rewre)
im pretty sure it wasnt 2log anyway, i thought it was X-2 LOG ????????
Ive just remembered because i remember plussing 2 to the other side!
That's probably the other later question with 3^(x-2)

(Original post by SGHD26716)
What about the separated logs?What were the equation?
2log base 3 (X) - log base 3 (X+4) = 2
Edit: the combined logs and the separated logs are equal so any manipulation, including squaring to remove the negative, will produce a correct answer
13. (Original post by rewre)
so u couldnt use the first number and D u had already found for part i ? u had to find it again with 1 , 2, 3 not using previous answer? this gave you A= 2.5 and D= 1
Yes you can use it but as far as I remember, U1 was 5 and Un+1 was Un+1.5 or so, giving a = 5 and d=1.5
14. (Original post by tangotangopapa2)
Yes you can use it but as far as I remember, U1 was 5 and Un+1 was Un+1.5 or so, giving a = 5 and d=1.5
Un = 1.5n + 3.5
15. (Original post by h3rmit)
That's probably the other later question with 3^(x-2)

2log base 3 (X) - log base 3 (X+4) = 2
Edit: the combined logs and the separated logs are equal so any manipulation, including squaring to remove the negative, will produce a correct answer
I got both 12 and -3, but said -3 is not valid since 2log base 3(-3) gives maths error. You could square the -3 but that's after manipulation and not the original equation. I really don't know. I wrote down 12 and -3 and then underlined 12
16. (Original post by iamDev)
I coudnt find the 2015 c2 paper so how hard was this compared that and if so what do you guys reckon the boundaries gonna be
I retook and would say that last years was similar in difficulty
17. Can you carry an error forward on core 2?
18. (Original post by SGHD26716)
I got both 12 and -3, but said -3 is not valid since 2log base 3(-3) gives maths error. You could square the -3 but that's after manipulation and not the original equation. I really don't know. I wrote down 12 and -3 and then underlined 12
They both worked fine for me but I'm not too sure
19. lol this was disgusting

Really hate AS its killing me LOOOL

Posted from TSR Mobile
20. (Original post by Isaacsutton123)
What was answer to question 2 on perimeter of sector my mind went blank 😞
Couldn't do this one 🙂🙂🙂🙂🙂🙂🙃🙃 🙃🙃🙃

Posted from TSR Mobile

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: May 25, 2016
Today on TSR

### Anxious about my Oxford offer

What should I do?

### Am I doomed because I messed up my mocks?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE