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# Mr M's OCR (not OCR MEI) Core 1 Answers May 2013 watch

1. (Original post by swaggy)
Hi what was the question to question 4 iii) ?

(Original post by Kitnimohabbathai)
what was the question for 4iii? I don't remember writing -39???
Finding the discriminant.
2. and also the question to the very first question haha
3. (Original post by aran0909)
Hi does anyone have the actual questions for:
7.ii)
4.i)
Thanks
7ii) is given earlier in this thread.

4i) express 3x^2+9x+10 in completed square form
4. (Original post by Mr M)
Sorry. And thank you! Last question, for the sketch the curve y= 2/x^2 does precision of where the curve is matter, or is it just the general shape?

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5. (Original post by Mr M)
I differentiated the equation for y, set it equal to zero and substituted x = -3.
thanks a lot mate, think i got 2 marks at least !!!!!
6. (Original post by Mr M)
7ii) is given earlier in this thread.

4i) express 3x^2+9x+10 in completed square form
thanks around how far back was it?
7. (Original post by Jo2484)
I was just wondering how you completed number 10iii?

Differentiate and set the gradient equal to 9 ...
8. (Original post by Coco406)
Well I gave the right answer, and made it clear to be my answer so I wrote:

"A stretch by scale factor 1/2 parallel to the y axis"
Then two or so lines below it I wrote really scruffily in brackets "(surely can be both y and x axis...)" in a note-like manner so that I would remember to go back to it at the end

Do you think the examiner will mark me wrong then? Im assuming so!
drop 1 mark
9. Can anyone explain 9ii please??!!

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10. (Original post by swaggy)
Hi what was the question to question 4 iii) ?
calculate the discriminant of 3x^2 + 9x + 10
11. (Original post by swaggy)
and also the question to the very first question haha
simplify 4 root 15 x root 3
12. (Original post by motivatedshroom)

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You just have to find out where the curve has a negative gradient.
13. does anyone know the actual question of 10iii

and how you would complete it! thank you
14. (Original post by Mr M)

Differentiate and set the gradient equal to 9 ...
Can I ask what the text of Question 9 was? 9iii, to be particular, with any relevant equations given in the earlier parts of the question ...
15. For q4 I simplified it to 3 1/4 instead of 13/4 would I lose any marks? And for q5 if I read the question wrong, and moved the graph 4 in negative x and got 2/(x+4)^2 how many marks would I lose?

Also is the correct sketch for the _)|(_ something like that? Again q5
As the grade boundaries haven't changed since june12 61/72 for a and 54/72 for , what would you expect?

Thank you!
16. would we get penalized for not simplifying square root 40 for the radius?
17. 9iii) y=4 meets the curve y=2x^2-x-6 at P and Q

hi there i put squareroot 81/4 which is 4.5 ( which is the answer) but i forgot to simplify how many marks do you think ill loose out of the 4 ?
Can I ask what the text of Question 9 was? 9iii, to be particular, with any relevant equations given in the earlier parts of the question ...
I've already typed this part of the question out a few pages ago.
19. (Original post by HayyanN)
would we get penalized for not simplifying square root 40 for the radius?
no
20. (Original post by philip1996)
9iii) y=4 meets the curve y=2x^2-x-6 at P and Q

hi there i put squareroot 81/4 which is 4.5 ( which is the answer) but i forgot to simplify how many marks do you think ill loose out of the 4 ?
I've answered this one 3 times now! Full marks for that.

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