For some reason, I think this paper will be harder than normal I can't speak for Mechanics, but the applied modules were so easy in comparison to recent years, and my friends who did mechanics agree. I mean S1, bar one question, was pretty easy on the scale of things, so I don't think that they'll let us off easy on C2. This is of course all speculation, but I don't know...

Can you please explain the neg? All I was doing was giving my honest opinion on what I think the paper's going to be like...

(edited 11 years ago)

Reply 233

Imposition

Original post by otrivine

can i ask for binomial if they for example say (3-x)power n and find n how do we do that?

N is just used in the example as a constant I would think.

But say you had 3^(n-2)•x and they told you that the coefficient of the x term was equal to 27, I would set 3^(n-2) equal to 27 and take logs.
But I doubt they'd do such a thing. Dunno how good of an example that was I just made it up :tongue:

(edited 11 years ago)

Reply 234

bijesh12

13

Original post by otrivine

can i ask for binomial if they for example say (3-x)power n and find n how do we do that?

for that, you would need to make the expansion in the form of (1 + x)^n.. so
in that case you'd have to take 3 out of the bracket so it would be come 3(1 - 1/3x)^n..

You'd expanding (1 - 1/3x)^n.. and then multiply the expansion by 3. i will send you an example step by step if you want.

Reply 235

UWS

21

Hey Arsey, what kind of Geometric Series are you predicting this year? One in context or a simple one?

Also, is simultaneous equations in terms of logarithms likely to appear?

Reply 236

xxZazxx

Hey everyone, i've got 2 questions
1. for the differentiation questions when it refers to a shape such as a cuboid etc, will the part a part always be a "show that" type of question, e.g. show that the surface area of this shape is 300/x + 2x. will you sometimes not give the surface area, and you have to conjure it up yourself. I only ask because sometimes i really struggle with getting to equation myself, and obviously if I can't do that then I can't do the rest of the question, so is it almost guarunteed that it will be a "show that"?? really worried about this.

2. how do you know when you can't just integrate directly under the curve between 2 limits to find the area, some questions you have to find the area of a triangle/rectangle and then find a small proportion of the area under the curve. I'm starting to get the hang of it, but these questions still throw me off course a little bit? so how do you know what to do?

Any help would be much appreciated :smile:

Reply 237

Sebpanas

Original post by xxZazxx

Hey everyone, i've got 2 questions
1. for the differentiation questions when it refers to a shape such as a cuboid etc, will the part a part always be a "show that" type of question, e.g. show that the surface area of this shape is 300/x + 2x. will you sometimes not give the surface area, and you have to conjure it up yourself. I only ask because sometimes i really struggle with getting to equation myself, and obviously if I can't do that then I can't do the rest of the question, so is it almost guarunteed that it will be a "show that"?? really worried about this.

2. how do you know when you can't just integrate directly under the curve between 2 limits to find the area, some questions you have to find the area of a triangle/rectangle and then find a small proportion of the area under the curve. I'm starting to get the hang of it, but these questions still throw me off course a little bit? so how do you know what to do?

Any help would be much appreciated :smile:

Generally, yeah they'll ask you to prove that the area is equal to something, so you have to use elimination to get the marks.
Be careful to read the questions thoroughly though, there was a past paper question were it said 'the area for an open top cuboid', and a lot of people didn't read the 'open top' part and lost the marks.

And it depends on the question, if you have two curves and need to find the area within given limits, then yeah you'll have to either find the area of a triangle/work out the area of one integrated curve and take it from the area of another.

Does that kinda clear it up?

Reply 238

Tanmayee

6

Original post by Larry31

For some reason, I think this paper will be harder than normal I can't speak for Mechanics, but the applied modules were so easy in comparison to recent years, and my friends who did mechanics agree. I mean S1, bar one question, was pretty easy on the scale of things, so I don't think that they'll let us off easy on C2. This is of course all speculation, but I don't know...

I agree, I think the paper will be harder mainly because the June 2011 was so easy and somehow it tends to fluctuate. But one can never know :P

Reply 239

Farzyy

For geometric series, how do you know when to use a(r^n-1) / r-1 or a(1-r^n) / 1-r ??

Is there a rule for using a certain one?

The Edexcel C2 (24/05/12 - AM) Revision Thread

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