Yes, they are so important that they get their own page 
Y12 and 13… here’s the place to shout for help, download papers, and generally discuss how pleased you are with yourselves for choosing the best subject ever. Or something like that.
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A Level534 comments to A Level |
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Hi Emma,
I think you are forgetting one of the halves. n is 1/2, then n-1 is -1/2 etc etc
but also your “x” is actually x/2 so that brings in another half which needs squaring, cubing etc as you continue the expansion.
Write all the terms out fully before trying to tidy it up, then you won’t make this mistake.
Good luck,
JT
OK – done this in Word to help with powers – hope it’s OK:
(4 + 2x)1/2
= 2[( 1 + x/2)]1/2
=2[1 + (1/2)(x/2) + (1/2)(-1/2)(x2/4)(1/2!) + (1/2)(-1/2)(-3/2)(x3/8)(1/3!) + …..]
=2[1 + x/4 – x2/32 + 3x3/384]
which gives you what you want when you multiply throughout by 2.
AAAGGH the powers haven’t worked! The numbers straight after the x’s are powers!!!
Thank you so much! What was I doing wrong?! You make it look so simple!… though I suppose that is why you are a maths teacher! Thank you
Without seeing your working, can’t tell – but DON’T work in decimals when you are doing binomial expansion because you can’t easily see the common factors for cancelling.
Yeah I think that didn’t help at all because I just started confusing myself :-/
Hello again!
Just one question.. if you have
(bx)^2
does that effectively mean b^2x^2 or still just bx^2?
Why is the bracket there Emma?
Work that out and you’ll have answered the question.
JT
Sorry for being late to the lesson today… I shall buy some biscuits for the biscuit barrel to make up for it
Mrs T! Sorry for missing the lesson today. And sorry for not having been on the blog for ages… I suppose it’s good as it means I didn’t have problems with maths homework (for once!)
What should I do to catch up?
Would you like my maths paper on your shelf tomorrow?
Oh and I’m about half way through music of the primes. I’m really enjoying it- especially the bits about mathematicians… I have to say trying to imagine the Zeta function in 4D was a bit beyond me. There you go. How’s Feynman going?
Hi Mel,
Hope you are feeling better. We missed you today
Yes, I’d like the maths paper please.
We started linear programming but we haven’t got very far yet. There are some notes(definitions) you need to copy up and then have a go at Ex 6A nos 1-5. I’m free in Period 3 if you want some help.
Glad you’re enjoying the book. I’m about halfway through Feymann.
Take care,
Mrs T
hello just wondering if mr burford is still doing that maths thing in school tomorrow because we havent got any letters home….and if so is any body going to go?
sorry still confused on intergration this hw is horrible (on a side note acutally mrs tibble how much of 6F did we have to do?)
and the real question what is the intergrated form of sin2x??? (ex 6G qu 3d)
and how do you do ex 6f qu 2e, sorry i’m just finding this so overly confusing
Sorry for the delay Fiona – Year 8 parents’ evening.
Questions 1 and 2 in 6F
-1/2 cos 2x + C
(check it by differentiating it)
2e) sec^4 = sec^2 x sec^2
differentiate u to deal with one and square u to deal with the other.
ah thank you, i’ll try and do it 2morrow at some point, as i’ve only just checked back in, i thought that was the one for 6F but it doesn’t quite work
wow everyone has pretty patterns by their name!
hang on a minute, where my little miss gone?!
Hiya, I found this really useful website with complete banks of all past papers that I thought generally everyone would find useful
Em
http://mathspapers.co.uk/edexcel.html
Hi Emma,
For some reason this went into spam – not sure why!! It occasionally goes a bit crazy like this!
Thanks for the link.
Emma, please look at the link in the post called Edexcel resources for year 13!
Deja vu?
MW
Oops! Sorry
…I’m Dory, ask Mrs Tibble!
Allo allo
I don’t suppose there is any way I could get hold of the C2 June 07 mark scheme? That website has accidentally put the C3 one up
Merci buckets
Em
Emma,
Go 4 comments up to where you posted a link to Edexcel. The June 07 mark scheme is there.
Emma,
See the new post just added.
Incidentally, if you need anything else for C2, the password-protected post for my Year 12 group has all the available papers and mark schemes. I don’t want to give the password here; are you in touch with Frankie, Claire, Marianna, Amber or Maeve? They could give it to you.
Mr Riedel
The link Emma posted above also has January 08.
Cool, thank you
How would you integrate the square root of (1.2^t -1) ?
Why do you need to? What’s the question?
Yeah I was just looking at it and I realised I don’t need to integrate it at all, sorry lol.
Phew – that’s a relief!!!
Lol! I’m a muppet!
mrs tibble i’m doing the C4 practice paper 3 and i’ve done the first part of qu 3 with no problems which was find the assecing powers of x up to an dincluding x^3 of (1+3x)^-2 , and the next part is to find the first three terms of x+4 / (1+ 3x)^2.
do i have to expand the top one using binomial expansion then multiply it by the answers i got for the bottom part or do i sub what i got for the bottom part as the x value in the top part??
Hi Fiona,
(1+3x)^-2 is the same thing as 1/(1+3x)^2
so all you need to do is to multiply your first 3 terms by x+4 and then tidy it up.
Tea Lady
ah danka i thought it would be something quite obvious but i just couldn’t click what