[Maths HELP!] Factorising...

[Agjsdfd]

Thanks for the confirmation.
In the book, there are only piss easy examples. And than, they ask you tough question straight away, and the review exam style questions looks chinese, without enough explanations from the teacher...(and I am not very concentrated during the class...)

 

[DarkRey]

aahh. hard life
i have maths(unit 4 calculator) gcse exams on monday too.
already done maths unit 4 non-calculator paper some weeks ago but im not confident that i did gud, missed some easy question which i knew but when i saw the questions my brain went blind. XD
on monday is gonna be hard... i can already see myself sitting in the exam hall and looking around and scratching my head. lol

gud luck to u on monday

p.s
when u answer a question dont forget to show the workings out and the formula even if is a calculator paper

 

[Agjsdfd]

Hehe thx. good luck to you too. Btw, the non-calculator paper was on 19th may, right? The exam was really easy, but I made loads of silly mistakes. And the thing is, I only make mistakes on the 3,4,5,6 mark questions... worth a lot!

 

[DarkRey]

lol,yeah it was on 19th of may.
which school do you go to?

 

[ShadowXP]

yup, i've got my maths calculator paper tomorrow too. hurray for the uk gcse season! only 8 days of school left ever for me, bring on college

the best ways of revising i have found have been, believe it or not, youtube (search something like "gcse maths x" where x is the maths subject you want to revise) and working on past papers. go to your exam board's website and download some papers and the answers!

 

[moozxy]

Yep for maths doing pastpapers is definatly the best way to revise. By doing 2 a day or something you'll know everything you need to for that module.

And GCSEs pshh they're simple, no need for any revision for those, just wait until you hit A2 Maths

 

[ShadowXP]

Yep for maths doing pastpapers is definatly the best way to revise. By doing 2 a day or something you'll know everything you need to for that module.

And GCSEs pshh they're simple, no need for any revision for those, just wait until you hit A2 Maths

a2 maths? no thank you! i can't wait to be done with the maths exam tomorrow... maths will be over FOREVER!

 

[Agjsdfd]

Well, I kinda was in long term vacation when i supposed to go to year 9. hehe.

So now I dont go to school, I go to college doing English, Maths, Biology, Chemistry, Physics GCSE. And German AS.

Will do Science AS, and German A2 next year.

No way I can fail GCSE, worse should be a B grade, and a C grade in English, as I fucked up the courseworks...

My last exam is on 20th June(Physics Unit 1).

 

[Agjsdfd]

Awright, everything was going pretty smooth and got stuck again...

*) Rationalise in the form of " a + b ?c " where a , b, and c are integers.

2 + ?2 / ?2

I dont know how to get the answer in that " a + b ?c " form.
I can rationalise it and got 2 + 2 / 2 at the end.. no surd was left...

 

[moozxy]

I think you got the question wrong.
√2 / √2 is 1, so 2+ √2 / √2= 3

 

[Agjsdfd]

The question is "*) Rationalise the denominators in the form of " a + b √c " where a , b, and c are integers."

and part "A" of the question is :

a) 2 + √2 over √2

so basically telling me to rationalise" 2 + √2 over √2 "

 

[moozxy]

Are you sure? >_>
√2 over √2 is 1, anything divided by itself is 1.

√2 over √2 is already rational.

 

[Agjsdfd]

I am sure.

Will write the whole thing again:

5) Rationalise the denominators and give your answers in the form of a+b√c where a, b and c are intergers.

and part a is)

2 + √2 over √2

Thats what is confusing me.
and thats why I get 2 as answer at the end and not in the form it wants me to do.

 

[moozxy]

Seriously there must be a typo on the question or you're reading it wrong..
Put it into a calculator, √2 over √2 will give you 1.

Normally on those questions the the denominator is a surd and you multiply the fraction by it to get it on top.

 

[Agjsdfd]

LoL, I am not blind.
the page before their were examples like this:

2 over √3

so we muplty by √3 over √3 and that gives us 2√3 over 3.
Pretty straight forward. And than they jump into questions like I have mentiond above...

And yes, I understand what you are saying, thats what is confusing me aswell.

I have found a loads of mistakes in my book today, maybe thats one of the mistakes aswell...

 

[Issac]

OOOH

is it (2+ √2) / √2?

√2*(2+ √2) / √2*√2

(2√2 + 2) / 2

√2 + 1



the answer is 1 + √2

EDIT: fixd

 

[moozxy]

Ohhhhhhhhhhhhhhhhhhhhh I think Issacs got it

 

[Agjsdfd]

2 + √2 over √2

so we multiply: 2 + √2 over √2 by √2 over √2

that gives us: 2+2 over 2..
edit: no thats wrong. Lemme do it again. hehe.

2 + √2 over √2

so we multiply it by √2 over √2

(2 + √2 over 2) x √2 over √2

which gives us

2 √2+2 over 2

still not in the form I want it...

 

[Issac]

2 + ?2 over ?2

so we multiply: 2 + ?2 over ?2 by ?2 over ?2

that gives us: 2+2 over 2..

no...

2 + ?2 multiplied with ?2 => 2?2 + 2
and in the denomenator you have 2

which renders it to be ?2 + 1

 

[Agjsdfd]

Ok so is it 2√2+1?

That matches the form I want it.. lol