Edexcel Mathematics: Core C1 6663 17th May 2017 [Exam Discussion]

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any predictions?

If your school has a code, this is a fab website: http://www.mathsnetalevel.com/

Also, Maths Genie has some topic questions:
http://www.mathsgenie.co.uk/alevel.html

Here are some particularly hard C1 papers. It's unlikely to be this hard in the exam but they're a nice challenge :smile:

http://www.madasmaths.com/archive_iygb_practice_papers_c1_practice_papers.html

(edited 6 years ago)

Reply 102

Sam_99

Could someone clear up for me when doing sequences questions when to use the a + (n-1)d or 1/2[2a+(n-1)d]

What key words do I need to look for so I know which one to use because I'm never completely sure.

Thanks

Reply 103

Notnek

Original post by Sam_99

The first one is the nth term of an arithmetic sequence and the second one is the sum of the first n terms of an arithmetic sequence.

Reply 104

Sam_99

Original post by notnek

The first one is the nth term of an arithmetic sequence and the second one is the sum of the first n terms of an arithmetic sequence.

Thanks but in exam questions what are the sort of trigger words to know which to use ? :biggrin:

Reply 105

BenSainsbury

Original post by Sam_99

Thanks but in exam questions what are the sort of trigger words to know which to use ? :biggrin:

For Un = a + (n-1)d, the question will be... "Find the 8th Term of the Sequence) for example. Of which you would plug in "8" as n.

For Sn = n/2(2a + (n-1)d), the question will be... "Find the Sum of the First 25 Terms" Of which you would have to plug in "25" as n.

Previously to these you may have to find "a" and "d"

Reply 106

LoDMR

If you want an insight on the kind of questions that may come up in the C1/C2 paper, I recommend looking at the C12 Jan 2017 IAL paper. I found that some of the questions in the june 2016 paper were quite similar to the C12 IAL 2016 january paper. Safe.

Reply 107

benfletcher99

Original post by LoDMR

Where can I get access to the c12 jan 2017 IAL paper?

Reply 108

LoDMR

Original post by benfletcher99

Where can I get access to the c12 jan 2017 IAL paper?

Could try searching it up or look on exam solutions under the C12 section

Reply 109

jayforreal18

WMA01_01_que_20170110.pdfHere's the c12 Jan 2017 paper

Reply 110

benfletcher99

Original post by jayforreal18

WMA01_01_que_20170110.pdfHere's the c12 Jan 2017 paper

Thank you!! By any chance do you have the mark scheme too?

Reply 111

jayforreal18

Original post by benfletcher99

Thank you!! By any chance do you have the mark scheme too?

Don't have the official mark scheme but here's a link to model answers

https://goo.gl/iOjA9l

Reply 112

F1 USM

Hey everyone... Now I'm completely lost by this trig question, why is it you only get the answer when you convert it into Cos?? At first I tried with tan and sin and I got viable answers, but you only get the answer of you do it as a cos function. Can anyone please explain to me why this is the case and why I can't change it to tan or sin??

Reply 113

DamnDaniel2

Original post by F1 USM

it works with sin.

3cos^2x + 1 = 4sin^2x

3(1-sin^2x) + 1 = 4sin^2x

3 - 3sin^2x + 1 = 4sin^2x

7sin^2x = 4

sin^2x = 4/7

sin x = +- root 4/7

plug sin^-1 (root 4/7) and you get one of the 4 solutions.

Reply 114

DamnDaniel2

Original post by jayforreal18

Don't have the official mark scheme but here's a link to model answers

https://goo.gl/iOjA9l

that was actually a really good paper. I'd be happy if the C1 and C2 papers are actually like that!

Reply 115

HKHASSAN

Help!

Question - [C1]

Find the equation of the normal to:

y = 6x^{\frac{5}{2}} - 4x^{\frac{3}{2}}

when

x = 2

in the form

ax + by + c = 0

Hint -
Solution -

Reply 116

jayforreal18

Original post by HKHASSAN

Help!

Question - [C1]

Find the equation of the normal to:

y = 6x^{\frac{5}{2}} - 4x^{\frac{3}{2}}

when

x = 2

in the form

ax + by + c = 0

Hint -
Solution -

First of all sub in x=2 to get y. Differentiate and put x=2 in to find the gradient. As it's the normal it's going to be the negative reciprocal. Then use your coordinate (1,y) and the gradient to find the equation of line

Reply 117

myathiemetjon

I was wondering if we need to know logarithms for C1? I know we need them for C2.

Thanks :smile:

Reply 118

myathiemetjon

Original post by Sam_99

You should be using a+(n-1)d when you are working out a term, for example when the question asks you to find the 4th term.

1/2[2a+(n-1)d] should be used when you are working out the sum of terms, for example when you are asked to find the sum of the 21st terms.

In the formula booklet a+(n-1)d is written as un = a + (n – 1)d so you know it has to be used to find the term, and 1/2[2a+(n-1)d] is written as Sn =1/2[2a+(n-1)d], so you know it has to be used to find the sum of a certain amount of terms.

If it says S3, find the sum of the first 3 terms.

If it says U6, find the sixth term.