The Edexcel C4 (21/06/12 - PM) Revision Thread

im only on q5 and struggling -_- thanks for the heads up.

Btw, which subjects do you do and with which board?

Have you watched the videos on the site i linked you to?

Have you read the examples in the book?

yep read all the examples. still as confused as anything. this topic is giving me nightmares. and yes im watching them. i dont no HOW people understand this topic. i find intergration much easier than this.

The problem becomes when you start to think that something is difficult! Don't assume it to be difficult try to think it is easy and you are missing something very silly.

Tbh, the first few questions of the exercise aren't difficult, its the last few ones which are challenging.

no matter how much I try understand this topic, I don't think i'll be able to. I f u c k i n g hate it. excuse my language

yep read all the examples. still as confused as anything. this topic is giving me nightmares. and yes im watching them. i dont no HOW people understand this topic. i find intergration much easier than this.

Be more postive! If you've figured out the rest of C4, this will also come. You just need to see that

$\dfrac {dy}{dx} = ...$

becomes

$\int ...\ dy = \int ...\ dx$

The above may come out in several different ways, but the trick is to spot which way works best and they often give you the form of the equation which you're trying to derive. Note the variables will almost certainly not be x and y though. Then put in the values supplied to calculate the constant of integration. Tidy up and you're sorted. Practice is all that's required.

stuck18 is doing the differentiation chapter right now, not the integration chapter

stuck18 is doing the differentiation chapter right now, not the integration chapter

But the differentiation's easy! The only thing that can be hard in C4 is integration, I believe.

Sorry, I thought she was talking about differential equations.

C4 integration isn't hard, it only requires more practice than other chapters. Though on the C4 scale integration is the hardest, but my weakest topic of C4 is vectors.

One thing you might have forgotten to go over is converting Cartesian equations to vectors; it is really easy but worth knowing.

(x-1)/2 = (y-2)/-3 = (z+3)/4

The brackets represent the fixed point and the denominator the direction

r = (1, 2, -3) + mu(2, -3, 4)