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

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Reply 1980

user977153

Need at least a C in this paper, got 90 in c3 but i'm not sure about this haha

Reply 1981

Saiyu

Nice one guys, cheers!

Reply 1982

stuck18

on the jan 2012 paper. q5b .. I only got 2t = 0 and pi .. why is there 2 more solutions to this.. ive even drawn out the CAST diagram. someone please help me :frown:

Reply 1983

user977153

Original post by DeadBullyMafiosi

Any last minute advice..any hards past papers anyone encountered to recomend to do or any specific question?

Solomons?

Reply 1984

DeadBullyMafiosi

Original post by DoctorVertigo

Solomons?

Can you send me the link please? Thank you :smile:

Reply 1985

john_bishop1

Original post by DeadBullyMafiosi

Can you send me the link please? Thank you :smile:

http://www.sci2.co.uk/papers/c4solomon.htm

Damn

How do you know when to use integration by parts and when to use integration by substitution?

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Reply 1988

exe

Original post by abu125

Thanks for that answer, but can you help on question 5c for Solomon paper K?

do you know the answer to a and b?
if so, you just find out where dy/dx = whatever it did in (b)
then make x or y the subject (probably y)

then you just replace y for the equation that you made y the subject of
then you'll either get a quadratic or a regular equation
then solve for x, input x to the original equation to get y.

Reply 1989

chaosdestro0

Original post by Huda134

How do you know when to use integration by parts and when to use integration by substitution?

This was posted from The Student Room's iPhone/iPad App

99% of the time they give you the u term.

Reply 1990

Ai-

Original post by Huda134

How do you know when to use integration by parts and when to use integration by substitution?

This was posted from The Student Room's iPhone/iPad App

parts when two variables are multiplied and sub when they tell you to use sub?

Reply 1991

grazie

Original post by stuck18

on the jan 2012 paper. q5b .. I only got 2t = 0 and pi .. why is there 2 more solutions to this.. ive even drawn out the CAST diagram. someone please help me :frown:

I suspect you didn't double the range, as you're working with 2t.

You still can't follow the crop question?

(edited 11 years ago)

Reply 1992

exe

Original post by Huda134

How do you know when to use integration by parts and when to use integration by substitution?

This was posted from The Student Room's iPhone/iPad App

i've never seen a paper where you've been expected to do integration by substitution without them explicitly telling the substitution and i've done every edexcel paper at least 3 times.

integration by parts is just used whenever you have two functions multiplied by each other, like xlnx or 2x^2(e^x)

Reply 1993

Arva

Original post by Huda134

What's eulers number?

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...e

Reply 1994

SnakehipsTTC

Original post by DeadBullyMafiosi

Any last minute advice..any hards past papers anyone encountered to recomend to do or any specific question?

Try the vector question on solomon A.

Reply 1995

Whatever9999

Original post by Arva

People will read your post no matter what font size it is, so please keep it regular, it's less of an eyesore. :tongue:

Use the acronym L.A.T.E: Logs, Algebra, Trig, Euler's number, and choose your U in that order.

So xsin3x ?? would your u be sin3x ?

Reply 1996

King_Arthur

Original post by abu125

Thanks for that answer, but can you help on question 5c for Solomon paper K?

that was a solid question >>>> :tongue:

answer Q(-1,-2)

now if the tangent is parallel that means the gradient at that point is the same right.....

so all u have to do is equate dy/dx to the gradient u got (3/2)

this will give you y in terms of x now substitute it in the main equation

and u have ur answer >>>>

thnx for the question

Reply 1997

stuck18

Original post by grazie

I suspect you didn't double the range, as you're working with 2t.

You still can't follow the crop question?

aha your right. I figured it out by staring at it and rereading all the info several times and literally hit my head *face palm* .. nervous are kicking in !