Edexcel Core 3 - 21st June 2016 AM

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Reply 1820

edothero

Original post by Pyslocke

Anyone reckon 73/75 is +95 UMS?

Reply 1821

SirRaza97

How many marks will I lose for the 6 marker question in question 8b?
I did everything right up to the part where I did my complete the square wrong (i put a + instead of a -).

Reply 1822

OldMathsAccount

Original post by us3r12345us3r

How many working marks do you think i would get on Q2b.) for finding a range using an incorrect dy/dx found in part a? and how many marks would i loose on question 9c.) for leaving as T= -5ln(1/2/(1+e^-1))

Probably one method mark depending on how you did it.

Probably lose 1, perhaps 2.

Reply 1823

PISA

guys and girls,

For the last part of question 9 I made a sign error and put -5ln(...) instead of 5ln(...)

The inside of my bracket was correct it seems, how many marks out of 4 do you think I would get for that?

I felt challenging paper, but for the top students it wouldn't have been as hard as people make it up to be, leading me to believe 72-75 for full ums, it tested time management as well as a variety of aspects that haven't come up in a while.

Reply 1824

Sapereaude54

For the sketch arcsin(x) question, I sketched it correctly; however, I sketch as what would be a reflection in the y-axis, so it would have been of the form f(-x). Do you think i've lost one mark or two despite getting the general shape correct?
Pls help!!

(edited 7 years ago)

Reply 1825

uk_shahj

Original post by samwray

What I'm wondering is the algebraic long division: somehow ****ed it up and am thinking I probably got 2 out of four marks in it. As I didn't really have time to go over it again I just used that answer, differentiated it, subbed in a value of x and got an equation of the normal with it. This answer will obviously be wrong because part a) is wrong but how much will that impact on part b) (part b) is six marks). I'm thinking maybe I at a push get 3 out of the 6 marks - maybe more, maybe less?

i did that aswell, messed up the long division so got a weird equation, part a was 4 marks, part b 5 marks. i think we get 2 method marks for each part so in total we lose 5 marks. this is my opinion though so i can easily be wrong

how much for 100ums?

Original post by Sapereaude54

I imagine you'll get a maximum of 1 mark. How many was it in total?

Reply 1828

OldMathsAccount

Original post by Yua

how much for 100ums?

74? 73 at a push

Reply 1829

TheMathsMan

Anyone willing to help a brother out ? ..." *** ... For the Rcos question I put -26.57 for alpha for some odd reason .. maybe be I though -sinx and thought -1 or some **** .. idk I was half asleep ... how many marks would I lose as it effects the entire question."

Reply 1830

OldMathsAccount

Original post by TheMathsMan

Not entirely sure but probably a lot I would guess. Sorry mate

Reply 1831

Maxoman

think i got 64 marks and i neeeeed 90 ums because i resat this exam from last year and i got 90 ums in core 4. im wanting to go to durham but part of the requirement is a* in maths. im so annoyed with myself for doing so many stupid mistakes..

Reply 1832

SturtScooby

Original post by mk_98

What did everyone get for the value of k (asymptote) on the graph. I got 21

as x tends to infinity, 4e^2x tends to zero, so you get mod of -25 being k, which is 25.

Reply 1833

crazymonkey007

For Question 8:

2 (1 - tan^2x) / 2tanx ) + tanx

= 1/tanx - (tan^2x / tanx) + tanx/1

= 1/tanx - (tan^2x / tanx) + tan^2x/tanx

=1/tanx + 0

= cot x

Reply 1834

Pyslocke

Original post by cjlh

Lol almost definitely..

Yeah I know it sounds like a stupid question xD. But it has to be 95 and not 93/94. Last year it was 68/75 for 95 so hopefully...

Reply 1835

veronica1297

Does Arsey still post an unofficial mark scheme?

Reply 1836

Pablo Picasso

Original post by Maxoman

Gonna have to do another year then.

Reply 1837

Pablo Picasso

Original post by crazymonkey007

For Question 8:

2 (1 - tan^2x) / 2tanx ) + tanx

= 1/tanx - (tan^2x / tanx) + tanx/1

= 1/tanx - (tan^2x / tanx) + tan^2x/tanx

=1/tanx + 0

= cot x

That's what I did. Very simple proof

Reply 1838

JoshuaKader97

Original post by fishs003

It wasn't my markscheme - I didn't do as well as that, all credit for it goes to the name on the thread, I just found it!

I did M1 this year and thought it was okay - hopefully got a solid A in it.
Although was aiming for an A had potential to reach for an A*, but don't think that will be the case after that C3 exam!

How did you think this years C3 compared to last years?

I think that it definitely pulled out more stops than last year, like that arcsin(x) graph never comes up and with exponential's that dosage has only ever come up once I think. So in that sense it was a bit more obscure than last year and I should expect the grade boundaries to be even lower, if not then the same.

Don't worry about the A*, you can still definitely get it by getting a really good mark in C4. Make sure that you've done most Gold papers and only do C4 past papers that are post 2011 as those are much more representative to what you're going to get this year.

Good luck!!

Reply 1839

veronica1297

Original post by Maxoman