Turn on thread page Beta
 You are Here: Home >< Maths

maths help watch

1. "express the following in the form a+b root 5, where a and b are constants"
how do i apply this question to these 4 questions...
(2+root5)squared
(3-2root5)squared
1 over root 5 + 1
1+ root 5 over 2- root 5
ASAP
2. (Original post by caitlindavies)
"express the following in the form a+b root 5, where a and b are constants"
how do i apply this question to these 4 questions...
(2+root5)squared
(3-2root5)squared
1 over root 5 + 1
1+ root 5 over 2- root 5
ASAP
What have you done/tried so far?

You need to expand the first two and rationalise the denominator for the last two.
3. (Original post by usycool1)
What have you done/tried so far?

You need to expand the first two and rationalise the denominator for the last two.
i havent done anything so far, i just dont understand what it means by a and b are constants
4. (Original post by caitlindavies)
i havent done anything so far, i just dont understand what it means by a and b are constants
a and b are constants (i.e. non changing values, basically a number in each case) that you need to work out.
5. (Original post by caitlindavies)
i havent done anything so far, i just dont understand what it means by a and b are constants
It means that whatever you work out the answer to be in each case, it will look like

where a and b are some 'ordinary' numbers (not surds) that you have to work out for yourself.
6. (Original post by caitlindavies)
i havent done anything so far, i just dont understand what it means by a and b are constants
Concrete example (which is intentionally not one of the expressions you've been asked to find):

To express in the form :

(treating the denominator as the difference of 2 squares)

(This answers the question, with a = 3/4 and b = 1/4, but you don't actually need to state what a and b would be).

Reply
Submit reply
Turn on thread page Beta

Related university courses

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 15, 2015
Today on TSR

Top unis in Clearing

Tons of places at all these high-ranking unis

Poll
Useful resources

Make your revision easier

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

Create your own Study Planner

Never miss a deadline again

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

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

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