Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    given that y=2^x solve that the equation
    2^x+3(2^-x)=4
    Online

    19
    ReputationRep:
    factor out 2^x and use logs, you'll have your answer quickly
    Offline

    15
    ReputationRep:
    Multiply both sides of equation by  2^x and you get a quadratic in disguise. Maybe let  p=2^x which may help you to notice that it is indeed a quadratic equation.
    Offline

    15
    ReputationRep:
    (Original post by alexschmalex)
    factor out 2^x and use logs, you'll have your answer quickly
    Wouldn't work.
    Offline

    19
    ReputationRep:
    (Original post by TumiZN)
    given that y=2^x solve that the equation
    2^x+3(2^-x)=4
    http://www.thestudentroom.co.uk/forumdisplay.php?f=38
 
 
 

University open days

  1. University of Bradford
    University-wide Postgraduate
    Wed, 25 Jul '18
  2. University of Buckingham
    Psychology Taster Tutorial Undergraduate
    Wed, 25 Jul '18
  3. Bournemouth University
    Clearing Campus Visit Undergraduate
    Wed, 1 Aug '18
Poll
How are you feeling in the run-up to Results Day 2018?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

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.