You are Here: Home >< Maths

# Surds rationalising/rearranging question Watch

1. I'm stuck with the last step of these sorts of questions, where there is a surd divided by another surd. After rationalising and simplifying, I don't know how to get rid of the division line so that the answer is in the form a+b(root)5. Thanks for helping!
Attached Images

2. (Original post by Sint)
I'm stuck with the last step of these sorts of questions, where there is a surd divided by another surd. After rationalising and simplifying, I don't know how to get rid of the division line so that the answer is in the form a+b(root)5. Thanks for helping!
Your method is correct! Just look over your working and check the numerator. It seems you made a slight slip in expanding the brackets (the simplifying bit).

PS. It is already in the form a+b(root)5! Remember that 'a' and 'b' can be a fraction
3. why do you write your surds like that? Looks like you're trying to use things like the cubed root of 5 instead of 3 root 5.
4. (Original post by Sint)
I'm stuck with the last step of these sorts of questions, where there is a surd divided by another surd. After rationalising and simplifying, I don't know how to get rid of the division line so that the answer is in the form a+b(root)5. Thanks for helping!
As a side note, try to write the numbers in front of your square roots like this:

The second one looks more like the 5th root of 5.
5. (Original post by surina16)
why do you write your surds like that? Looks like you're trying to use things like the cubed root of 5 instead of 3 root 5.
Oh god...

I think I just had a heart attack.
6. also, -7 + 3 = -4
7. (Original post by RDKGames)
Oh god...

I think I just had a heart attack.
what... did I say something stupid?
8. (Original post by surina16)
what... did I say something stupid?
No, I'm agreeing with you.

At least the cat is nice.
9. (Original post by RDKGames)
No, I'm agreeing with you.

At least the cat is nice.
Ah, you had me questioning all my maths skills there for a minute

I agree.
10. Thanks for the help guys!

Posted from TSR Mobile

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:
Updated: September 13, 2016
Today on TSR

Can you relate?

### Do girls find this attractive?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• 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