You are Here: Home >< Maths

# Solving Equations

Announcements Posted on
Would YOU be put off a uni with a high crime rate? First 50 to have their say get a £5 Amazon voucher! 27-10-2016
1. The following has caught me out;

2x = 512

I have no idea where to start, but I think the use of logs is needed?

Could someone point me in the right direction?

Rep for useful response!
2. (Original post by MrBlackwood)
The following has caught me out;

2x = 512

I have no idea where to start, but I think the use of logs is needed?

Could someone point me in the right direction?

Rep for useful response!
Take log base 2 of both sides (or if your calculator doesn't support that - just take regular logs of both sides).

This is one of the most basic logarithm questions - have you studied logs properly yet?
3. (Original post by hassi94)
Take log base 2 of both sides (or if your calculator doesn't support that - just take regular logs of both sides).

This is one of the most basic logarithm questions - have you studied logs properly yet?
Thank you!!

And no, haha. We were taught the rules in 3 minutes and expected to be experts with no further teaching
4. Or if you have a calculator...you can simply divide 512 by 2 for 9 times...

hence you get 2^9 = 512...

(but taking log I think is the better option)
5. Loga^x = xLoga

Hopefully this is a nudge in the right direction :P
6. could also take natural logs...
7. (Original post by Hasufel)
could also take natural logs...
The base is irrelevant as long as it is the same on both sides, just happens that in this case base 2 is convenient for the 512...

## 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 16, 2012
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

### University open days

Is it worth going? Find out 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