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# Edexcel C3 June 2016 - Unofficial Mark Scheme

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Why bother with a post grad course - waste of time? 17-10-2016
1. (Original post by jbaten)
you'll be lucky if you get any marks if you answered the first part of that question correctly where there was a quartic expression divided by a quadratic and put it into the form asked for you should have been able to differentiate by first changing into a form suitable for differentiation involving terms with powers only then find x or y value by letting either = 0 unless they they provided it already in which case no need to equate to 0 .
yeh but i just hope because i attempted the quotient rule and did -1/m to get the gradient of the normal that i might get 1 M1 mark... just 1 mark is all I'm asking for argh !!!
2. c3 model answers... https://5f0ddd0845fce56d29dd3e023a91...%20kprime2.pdf
3. (Original post by veldt127)
If you have the right answers and showed a valid method, you'll get the marks
I see.. I was really worried..I need to get at least 90 UMS in c3
4. (Original post by fefssdf)
yeh but i just hope because i attempted the quotient rule and did -1/m to get the gradient of the normal that i might get 1 M1 mark... just 1 mark is all I'm asking for argh !!!
It's good to be optimistic if i were you i'd be more concerned with the differential equation and integration by parts and the vector questions that are going to come up in c4 tomorrow good luck.
5. (Original post by jbaten)
It's good to be optimistic if i were you i'd be more concerned with the differential equation and integration by parts and the vector questions that are going to come up in c4 tomorrow good luck.
see i love all of that stuff ; the way i see it if you don't know it the day before then you're not gonna know it by the exam
6. (Original post by fefssdf)
see i love all of that stuff ; the way i see it if you don't know it the day before then you're not gonna know it by the exam
That is indeed true.
7. what do we think is needed for A* or A?
8. Thank you
9. 8b, if i got the right sizes but the wrong directions so all are opposite signs would that be -4 marks?
10. For the iteration q, could you also sub in 1.4365 and 1.4375 into x-1/2ln(1/2x+17)? that also gave a change of sign?
11. How much would 71/75 be?? (Thank you in advance!)
12. So what do we think the A* boundary will be?
13. (Original post by saarah_soldier)
So what do we think the A* boundary will be?
Maybe 67?
14. (Original post by President J)
what do we think is needed for A* or A?
My guess would be A*-67 and A-60.
15. If you take -4 out the constant becomes -5 .so you cant cancel.I did the same.will the marker ignore that part becuase the correct answer is right above it
16. What do you think A* would be for C4???
17. (Original post by Engineerrookie)
What do you think A* would be for C4???
69/70, easier paper than last year which was 68
18. (Original post by Nadun97)
If you take -4 out the constant becomes -5 .so you cant cancel.I did the same.will the marker ignore that part becuase the correct answer is right above it
I don't know what question you're talking about specifically but mark schemes usually say that incorrect working following a correct answer should be ignored - i.e. if you try to simplify a correct answer but make a mistake, you will get full marks. This doesn't apply if e.g. the question asked you to leave your answer in a specific form or if you went on to use the incorrect answer in a later part of the question, but I'm guessing it covers the question you're talking about here.
19. (Original post by Nadun97)
If you take -4 out the constant becomes -5 .so you cant cancel.I did the same.will the marker ignore that part becuase the correct answer is right above it
I dome exactly the same, I assumed it did because it said leave it in simplified form, let's hope they give us full marks but at most they'll minus one I think

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