Edexcel FP3 June 2015 - Official Thread

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Reply 220

xyzmaster

Original post by mmms95

yeah, why don't you want to?

tired of exams i guess

Reply 221

Gome44

Can someone help me on June 2009 question 8. I keep getting the negative of the right answer :/

image.jpg436.7KB

Reply 222

math42

Original post by Gome44

Can someone help me on June 2009 question 8. I keep getting the negative of the right answer :/

I'm getting that too when I do it. :redface:

edit: actually wait no, don't the limits start as 1 to 0 and then because of the minus they switch so 0 to 1 with a positive sign?

edit again: I started from the given parametric formula in the booklet so that the limits were 0 to pi/2 rather than pi/2 to 0 but I don't see why the manner in which you changed them from x could possibly be wrong

(edited 8 years ago)

Reply 223

Navo D.

Original post by Gome44

Can someone help me on June 2009 question 8. I keep getting the negative of the right answer :/

You have your limits the wrong way around, they want it from 0 to alpha so by switching limits the two negatives cancel

Reply 224

Gome44

Original post by Navo D.

You have your limits the wrong way around, they want it from 0 to alpha so by switching limits the two negatives cancel

Switching which limits??

Also on my last line the upper limit looks like a 10 when it should be a 1

Reply 225

Navo D.

Original post by Gome44

Switching which limits??

Also on my last line the upper limit looks like a 10 when it should be a 1

The integration is carried out between 0 and pi/2, and according to the substitution c will be 1 and 0 respectively. Since they want it in the form of an integral from 0 to alpha, you have to switch the limits which helps you cancel that pesky negative

Reply 226

math42

Original post by Gome44

I think the issue may be that when you switched the variable to start with (from x to theta, not theta to c) your dx/dtheta was negative but this negative sign doesn't appear
So at that point you should have a negative and then it switches to go from 0 to pi/2 instead of pi/2 to 0.

Reply 227

soundhippo

Join the Further Mathematics Chat-room here http://us20.chatzy.com/16507605831021

Reply 228

adorablegirl1202

Can someone please help me with June 2014, 6c

Reply 229

Gome44

Original post by 1 8 13 20 42

ah, ok, thanks :smile:

If i was in the real exam i probably would have just fudged it though :smile:

Reply 230

violin101

how would you simplify (x²-1)ⁿ +(x²-1)^n-1?

Reply 231

TeeEm

Original post by violin101

how would you simplify (x²-1)ⁿ +(x²-1)^n-1?

factorize the bracket in its lowest power

Reply 232

username1162972

Original post by violin101

how would you simplify (x²-1)ⁿ +(x²-1)^n-1?

Factor the expression to the n-1.
So it becomes x^2(x^2-1)^N-1

Posted from TSR Mobile

Reply 233

username1259045

Original post by violin101

how would you simplify (x²-1)ⁿ +(x²-1)^n-1?

what's the question?, like which paper

Reply 234

TeeEm

Original post by adorablegirl1202

Can someone please help me with June 2014, 6c

normally I would but I am very busy at the moment.
here is my solution from my archive

FP3, June 2014, page 4.jpg518.4KB

Reply 235

Teddysmith123

Can someone help me with question 8 for the june 14 R paper?

I don't understand why they have changed the signs from -2i-11j+5k to 2i+11j-5k

Also for the second part of the question it only works if in the first part you eliminated the X variable and I don't understand why?

https://3a14597dd5c7aa2363f0675717665774b02557b0.googledrive.com/host/0B1ZiqBksUHNYQWE5bVRTVE9BLW8/June%202014%20(R)%20QP%20-%20FP3%20Edexcel.pdf

https://3a14597dd5c7aa2363f0675717665774b02557b0.googledrive.com/host/0B1ZiqBksUHNYQWE5bVRTVE9BLW8/June%202014%20(R)%20MS%20-%20FP3%20Edexcel.pdf

Reply 236

Elcor

Why are some of the mark schemes like this? Makes it almost completely unreadable.

http://gyazo.com/fee9b3a3c78819933672642adef6be57
http://gyazo.com/babd5e71a51fde96fc84b5b8f32e4eaf

Reply 237

luckystar1900

Original post by Elcor

Why are some of the mark schemes like this? Makes it almost completely unreadable.

http://gyazo.com/fee9b3a3c78819933672642adef6be57
http://gyazo.com/babd5e71a51fde96fc84b5b8f32e4eaf

What past papers are they from? I've never seen any like that before

Reply 238

Elcor

Original post by luckystar1900

What past papers are they from? I've never seen any like that before

June 13 - I've seen it quite a few times. Perhaps it's my computer somehow?

Reply 239

luckystar1900

Original post by Elcor

June 13 - I've seen it quite a few times. Perhaps it's my computer somehow?

Seems so.. this is how the same markscheme looks on my computer, I get my past papers from phsyicsandmathstutor.com so perhaps there is some weird formatting going on for yours :frown: