Edexcel FP3 June 2015 - Official Thread

Only got Chapter 2 left now! Seems straightforward but everyone seems to be worrying about loci so :s-smilie:

Is this everyone's last exam?

Reply 22

FN510

Original post by BP_Tranquility

Ive been thinking the same- some of these Q's are incredibly more difficult than the examples or the previous exercises

And the solutions aren't the best IMO

Reply 23

FN510

Original post by Navo D.

Only got Chapter 2 left now! Seems straightforward but everyone seems to be worrying about loci so :s-smilie:

Is this everyone's last exam?

Yeah, I've got it back-to-back with S2! How's matricies?

Reply 24

Original post by Navo D.

Only got Chapter 2 left now! Seems straightforward but everyone seems to be worrying about loci so :s-smilie:

Is this everyone's last exam?

What do you find hardest about vectors?

I don't find the loci in FP3 that hard, it's mainly just using algebra to prove that you can express a function in the form of an ellipse/hyperbola and hey presto

Reply 25

Original post by FN510

Yeah, I've got it back-to-back with S2! How's matricies?

Thank god I did S2 last year :tongue:

Matrices is pretty straightforward actually, def not as hard as I was expecting. The problem is that I still don't understand WHY we're meant to follow these strict set of operations on matrices - the book should include more on linear algebra and why they work etc

Original post by Elcor

What do you find hardest about vectors?

I don't find the loci in FP3 that hard, it's mainly just using algebra to prove that you can express a function in the form of an ellipse/hyperbola and hey presto

The last bit of the chapter with shortest distance etc still isn't intuitive to me, hopefully I'll internalise it soon!

Can't wait for some algebra bashing :colone:

Reply 26

There doesn't seem like much to go through with differentiation and integration, especially since the formula booklet already tells you most of the formulae (except what integration by reduction is).

Reply 27

Original post by simonli2575

There doesn't seem like much to go through with differentiation and integration, especially since the formula booklet already tells you most of the formulae (except what integration by reduction is).

I'm just hoping that I can spot the trick for rearranging/rewriting the reduction expression in the exam :tongue:

Reply 28

Original post by Navo D.

I'm just hoping that I can spot the trick for rearranging/rewriting the reduction expression in the exam :tongue:

Part of me's hoping to wing it, and the other part of me's hoping to learn it. :tongue:

At the very least, I think it involves integration by part, and that the first part of it will always result in zero.

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Reply 29

Original post by simonli2575

Part of me's hoping to wing it, and the other part of me's hoping to learn it. :tongue:

At the very least, I think it involves integration by part, and that the first part of it will always result in zero.

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I found some of the book questions very difficult, Ex. 4F Q11 had me stumped! Hopefully nothing like that shows up.

Reply 30

Original post by Navo D.

I found some of the book questions very difficult, Ex. 4F Q11 had me stumped! Hopefully nothing like that shows up.

I only got it on my second trial. But yeah, it wasn't really obvious even when the formula is given.

Reply 31

FN510

Original post by Navo D.

I'm just hoping that I can spot the trick for rearranging/rewriting the reduction expression in the exam :tongue:

Yeah, same. Allow the ones which require integration twice

Reply 32

BP_Tranquility

If you need to find the surface area or volume by revolution if the curve's rotated pi radians about the x/y axis (instead of 2pi), do you just replace the 2pi's in the formulae with pi ?

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Reply 33

Original post by BP_Tranquility

If you need to find the surface area or volume by revolution if the curve's rotated pi radians about the x/y axis (instead of 2pi), do you just replace the 2pi's in the formulae with pi ?

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Yes.

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Reply 34

VannR

21

Original post by Navo D.

I'm just hoping that I can spot the trick for rearranging/rewriting the reduction expression in the exam :tongue:

Original post by simonli2575

Part of me's hoping to wing it, and the other part of me's hoping to learn it. :tongue:

At the very least, I think it involves integration by part, and that the first part of it will always result in zero.

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An old post, but I just thought that I'd add that in last year's FP3 exam, the reduction formula question actually required that you did the opposite of reduction in order to solve the question i.e they gave you I2, and you need to use I3 in order to answer the question. It's not always a case of pure reduction. I have never seen this use of reduction formulae in any other question before, and this one had a lot of people (including myself) stumped last year.

Just keep this in mind.

Reply 35

Urgh completely forgotten reduction formulae methods -.- by parts isn't working

Reply 36

Could someone put me on the right track please?

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Reply 37

Original post by Elcor

Could someone put me on the right track please?

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I think I've seen something similar in the 2011 paper.
Try integration by parts, keeping x^n constant and integrating with respect to (1+x)^1/2, then separate (1+x)^1.5 into (1+x)^1*(1+x)^1/2 in the next integral.

Reply 38