You are Here: Home >< GCSEs

# Help with an exponential equation please watch

1. Hi, please can someone help me with the equation

3^x-3^(2-x)=8

I believe that you have to find the same base, then set the exponents equal. It is the first stage that I am struggling with.
Thanks so much

Edward
2. (Original post by Edwarddelve01)
Hi, please can someone help me with the equation

3^x-3^(2-x)=8

I believe that you have to find the same base, then set the exponents equal. It is the first stage that I am struggling with.
Thanks so much

Edward
3^(2-x) = 3^2 multiplied by 3^-x does that help?
3. (Original post by Edwarddelve01)
Hi, please can someone help me with the equation

3^x-3^(2-x)=8

I believe that you have to find the same base, then set the exponents equal. It is the first stage that I am struggling with.
Thanks so much

Edward
Well i know that x=2 just trying to work out a way of writing that to get the answer
4. (Original post by Muttley79)
3^(2-x) = 3^2 multiplied by 3^-x does that help?
Thanks for trying, but I’m looking for a way to make the 3 and 8 the same using exponents, can you help with that bit? Thanks again
5. (Original post by roborto1999)
Well i know that x=2 just trying to work out a way of writing that to get the answer
I had used wolfram alpha to find that solution, but without pro I can’t see the steps. Can you help me with that?
6. (Original post by Edwarddelve01)
Thanks for trying, but I’m looking for a way to make the 3 and 8 the same using exponents, can you help with that bit? Thanks again
Try multiplying through by 3^x - then I think you get a quadratic.

I don't think it's what you think.

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: October 8, 2017
Today on TSR

### 2,617

students online now

Exam discussions

Poll
Useful resources

## Study tools

### Essay expert

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

See where you can apply with our uni match tool

### Make study resources

Create all the resources you need to get the grades.

### Create your own Study Plan

Organise all your homework and exams so you never miss another deadline.

### Resources by subject

From flashcards to mind maps; there's everything you need for all of your GCSE subjects.

### Find past papers

100s of GCSE past papers for all your subjects at your fingertips.