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

Econ exams are in June with the rest of my A2s Economics at SOAS, hby?

So everyone is ready for C1 I'm presuming, and what is the best revision to do today for C1 (one day before the exam) ?

I did this mock paper and i got like 57
anyone else wanna try it and tell me because i feel like its wayyy harder than usual. usually I get around 67-72.
http://onmaths.com/mock_exams/edexcel-c1-a-level-2017-prediction/

I will have a go - i might have done it before (im not sure) 57 is a B i think

Welcome to the massive C1/C2 preperation thread for Edexcel, though other exam boards or students can use it for practice. The reason why I didn't include OCR or other exam boards is because they may have some different topics that are not tested in the Edexcel syllabus, however - for the exam boards, most of the topics are the same!

This is the place to discuss, post problems, or ask any questions you may have regarding the exam!

If your post or question gets missed or no one replies to it, you can ask these people individually who are willing to help: @Cryptokyo @Zacken @crashMATHS @RDKGames @B_9710 @xzh

If anyone would like to be tagged in this thread (helpers) who are willing to help students with problems, can they please quote me and I'll tag them at the start of the post so people know who to tag if this thread ever becomes inactive.

In essence, I would really like students to post the most difficult questions they've encountered or tricky ones (with confusing wording) or ones that are not straightforward because these are the ones which often make a student panic - simply because they don't understand the content well enough or are unsure about how to answer the question due to its style.

CAN PEOPLE PLEASE POST LINKS TO REVISION RESOURCES OR ANY SPECIAL PAPERS THEY HAVE (EXCEPT EDEXCEL OR OTHER EXAM BOARDS C1 2016 FOR NOW) OR ANY MATERIALS THAT WOULD CONTRIBUTE TO THE THREAD. THANK YOU VERY MUCH!!

Edexcel C1 Exam Date - 17 MAY 2017
Edexcel C2 Exam Date - 24 MAY 2017

Revision Resources:

Exam Solutions C1 Videos
Exam Solutions C1 Papers
crashMATHS Practice Papers (credit to @crashMATHS )
Edexcel A-level Maths Section (past papers, specification etc)
Various C1 resources
Various C2 resources
M4ths
Khan Academy (generalised, you have to search for topics)
Daily revision sheets for C1 (complete one per day, each sheet dated)
Maths videos by Jayates
MyMaths
MrBartonMaths C1
MrBartonMaths C2

Credit to @Cryptokyo for this excellent resource, also attached in this post too.

All the formula/rules for Edexcel C1:

The formulae highlighted in red are the ones given to you in the formulae booklet, the rest you have to memorise - no excuses because I have noted down all the laws and necessary formulae that you are required to know in C1.
Basic laws

$\displaystyle a^m \cdot a^n = a^{m+n}$

$\displaystyle \frac{a^m}{a^n}=a^{m-n}$

$\displaystyle (a^m)^n = a^{mn}$

$\displaystyle a^{-m}=\frac{1}{a^m}$

$\displaystyle a^{\frac{1}{m}}=\sqrt[m]{a}$

$\displaystyle a^{\frac{n}{m}}=\sqrt[m]{a^n}$

$\displaystyle a^0=1$

$\displaystyle x^2-y^2=(x+y)(x-y)$ - difference of two squares

$\displaystyle \sqrt{ab}=\sqrt{a} \cdot \sqrt{b}$

$\displaystyle \sqrt{ \frac{a}{b}}=\frac{ \sqrt{a} }{ \sqrt{b} }$

Rationalising the denominator involving surds:

$\displaystyle \sqrt{\frac{1}{a}}=\frac{1}{ \sqrt{a} }=\frac{1}{ \sqrt{a} }\cdot \frac{\sqrt{a}}{\sqrt{a}}=\frac{ \sqrt{a} }{a}$


Quadratics:

$\displaystyle x^2+bx=(x+\frac{b}{2})^2-(\frac{b}{2})^2$ (completing the square)

Solutions to $ax^2+bx+c=0$ are given by $\displaystyle x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$ (quadratic formula)

The discriminant of the quadratic formula is $b^2-4ac = \Delta$ and if:-
$\Delta < 0 \Rightarrow$ no real roots
$\Delta = 0 \Rightarrow$ repeated real roots (or a single root)
$\Delta > 0 \Rightarrow$ 2 distinct real roots

You should know the transformations of graphs.

Equations of a straight line:

A line passing through $(x_1, y_1)$ and $(x_2,y_2)$ has equation $y-y_1=m(x-x_1)$ where $\displaystyle m=\frac{y_2-y_1}{x_2-x_1}$

Different forms include $y=mx+c$, $ax+by+c=0$ and $\displaystyle \frac{y-y_1}{y_2-y_1}=\frac{x-x_1}{x_2-x_1}$

Parallel lines have the same gradient. The product of the gradients of two lines which are perpendicular to one another is -1.
Perpendicular lines have gradients -1/m.

Gradient of a line: m = $\frac {y2 - y1}{x2-x1}$ - difference in y coordinates / difference in x coordinates

Sequences:

The $n^{th}$ term of an arithmetic sequence, $u_n$, with first term $a$ and common difference $d$ is given by $u_n=a+(n-1)d$

The sum of the first $n$ terms of an arithmetic sequence,$S_n$, is given by $S_n=\frac{n}{2}[2a+(n-1)d]=\frac{n}{2}[a+L]$ where $L$ is the final term.

I cannot highlight this due to some latex problem, but: $S_n=\frac{n}{2}[2a+(n-1)d]$ is given in the formulae booklet, whereas \frac{n}{2}[a+L]

when do you put inequalities together or separate i.e x>3 x<9 and not 7<x>2 and vica versa

when do you put inequalities together or separate i.e x>3 x<9 and not 7<x>2 and vica versa

when do you put inequalities together or separate i.e x>3 x<9 and not 7<x>2 and vica versa

SOAS???

Engineering at Herts for me

I will have a go - i might have done it before (im not sure) 57 is a B i think

have you tried it. sorry for bothering u

SOAS???

Engineering at Herts for me

Hi, I hold an unconditional offer for Mechanical Engineering at herts, not yet met anyone doing engineering! Are you a part of any of the group chats on facebook?