You are Here: Home >< Maths

# How would you rearrange this expression

Announcements Posted on
Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. 20 - 1/4λK^(1/2)L^(-3/4)

I need to make λ the subject

My approach would be

20 = 1/4λK^(1/2)L^(-3/4)

80= λK^(1/2)L^(-3/4)

Multiply both sides by K^-(1/2), as I am aiming to get K^0 on the RHS

80K^-(1/2) = λL^(-3/4)

multiply both sides by L^3/4 as I am aiming to get L^0 on the RHS

80K^-(1/2)L^(-3/4) = λ

Is this the correct approach ?
2. (Original post by jon2016)
20 - 1/4λK^(1/2)L^(-3/4)
I'm assuming you meant to set that entire expression equal to 0?

i need to make λ the subject

My approach would be

20 = 1/4λK^(1/2)L^(-3/4)

80= λK^(1/2)L^(-3/4)

Multiply both sides by K^-(1/2), as I am aiming to get K^0 on the RHS

80K^-(1/2) = λL^(-3/4)

multiply both sides by L^3/4 as I am aiming to get L^0 on the RHS

80K^-(1/2)L^(-3/4) = λ

Is this the correct approach ?
Yep.
3. What ever you do on one side you do to the other

## 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: April 30, 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
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams