Turn on thread page Beta
    • Thread Starter
    Offline

    2
    ReputationRep:
    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
    Offline

    19
    ReputationRep:
    (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?
    Offline

    5
    ReputationRep:
    (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
    • Thread Starter
    Offline

    2
    ReputationRep:
    (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
    • Thread Starter
    Offline

    2
    ReputationRep:
    (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?
    Offline

    19
    ReputationRep:
    (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.
 
 
 

2,617

students online now

800,000+

Exam discussions

Find your exam discussion here

Poll
Should predicted grades be removed from the uni application process
Useful resources

Study tools

Rosette

Essay expert

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

Thinking about uni already?

Thinking about uni already?

See where you can apply with our uni match tool

Student chat

Ask a question

Chat to other GCSE students and get your study questions answered.

Creating

Make study resources

Create all the resources you need to get the grades.

Planner

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.

Papers

Find past papers

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

Help out other students

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.