You are Here: Home >< A-levels

# Maths

Announcements Posted on
Four hours left to win £100 of Amazon vouchers!! Don't miss out! Take our short survey to enter 24-10-2016
1. (Original post by RDKGames)
Yes it is. I'm showing multiplication by the conjugate of it.
Ah yes of course.
2. (Original post by RDKGames)
Close.
My numerator factors were -42√2, 153, -56 and 102√2
Did you get the same?
3. (Original post by Elisa2000)
Look, minus sqrt 2 and sqrt 2 when multiplied make minus 2
Look what?? You're right.
4. (Original post by Notch)
My numerator factors were -42√2, 153, -56 and 102√2
Did you get the same?
5. (Original post by RDKGames)
Well 153 - 56 = 97 and 102√2 - 42√2 = 60√2
and the denominator is 1... I don't see where I went wrong
6. (Original post by RDKGames)
Look what?? You're right.
Exactly, so you take that away from 211 ( 153 + 28)
7. (Original post by Notch)
Well 153 - 56 = 97 and 102√2 - 42√2 = 60√2
the denominator is 1, so?
Yeah. Can you see how different it is to:

(Original post by Notch)
Spoiler:
Show
I got 97 - 60√2
?
8. loool gotcha, the worst part is i wrote it down as 97 + 60√2 ;_;
9. (Original post by RDKGames)
Where did you get the -56 from???
10. (Original post by Elisa2000)
Exactly, so you take that away from 211 ( 153 + 28)
No. You misunderstand the calculation.

11. I got
I could plug it into a calculator and check but I'm too lazy.
12. (Original post by RDKGames)
No. You misunderstand the calculation.

How come you are multiplying the -2 ?
13. (Original post by XOR_)
I got
I could plug it into a calculator and check but I'm too lazy.
well done
14. (Original post by Elisa2000)
How come you are multiplying the -2 ?
You are multiplying 28 by

We have established that is equal to

So we are multiplying 28 by -2.
15. (Original post by RDKGames)
You are multiplying 28 by

We have established that is equal to

So we are multiplying 28 by -2.
Okay
16. (Original post by Elisa2000)
What is 51-14 sqrt 2 divided by 3 -2 sqrt 2

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: September 18, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

Poll

## All the essentials

### Student life: what to expect

What it's really like going to uni

### Essay expert

Learn to write like a pro with our ultimate essay guide.

### Create a study plan

Get your head around what you need to do and when with the study planner tool.

### Resources by subject

Everything from mind maps to class notes.

### Study tips from A* students

Students who got top grades in their A-levels share their secrets

## Groups associated with this forum:

View associated groups
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.