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

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1. for 9 iii I squared the side which had root3cosax only. Then I substituted in 3(1-sin^2ax) for that side. I cant remember if it was ax but would that gain any marks??? Please could you reply. I would really appreciate it. Thanks.
2. (Original post by ComputeiT)
Using previous part:
x^2/(x+4) = 3^2 = 9
x^2=9(x+4)
x^2=9x+36
x^2-9x-36=0
(x-12)(x+3)=0
x=12 or -3

But log base 3 (-3) is undefined.
Therefore x = 12
I originally thought this and put down my answer as x = 12. But then I realised that 2log3(-3) is the same as log3(9) [(-3)^2 = 9]. So isn't -3 allowed? If you do this on your calculator you get the correct answer. I'm not saying you're wrong I just don't understand why -3 isn't allowed.
3. (Original post by mrbeady9)
I originally thought this and put down my answer as x = 12. But then I realised that 2log3(-3) is the same as log3(9) [(-3)^2 = 9]. So isn't -3 allowed? If you do this on your calculator you get the correct answer. I'm not saying you're wrong I just don't understand why -3 isn't allowed.
Sketch a graph of log3(X)
4. (Original post by Mr M)

Let a = 5 and d = 1.5 and solve.
I used both as the sum of the geometric series due to the previous question, will I get any marks do you think? I used the correct method throughout but didn't get a quadratic equation. I think I've averaged out at about 55 marks, should that be at least a C, I did want at least a B though.

Thank you for your time.
5. (Original post by ArranJones)
I used both as the sum of the geometric series due to the previous question, will I get any marks do you think? I used the correct method throughout but didn't get a quadratic equation. I think I've averaged out at about 55 marks, should that be at least a C, I did want at least a B though.

Thank you for your time.
If you found the sum to infinity was 1200, you'll get 1 mark. I doubt whether you'll get more credit as you completely misunderstood what you were expected to do.
6. (Original post by Mr M)
If you found the sum to infinity was 1200, you'll get 1 mark. I doubt whether you'll get more credit as you completely misunderstood what you were expected to do.
Okay then, thank you. I do understand the question. Just didn't do it properly in the exam, worst feeling ever!
7. (Original post by ArranJones)
Okay then, thank you. I do understand the question. Just didn't do it properly in the exam, worst feeling ever!
It's one question out of 6 modules. It won't prevent you from getting the grade you need in the end.
8. What was the question for 8iv?
9. if there a stats thread?

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